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Asymmetric optical properties and bandgap shift of pre-strained flexible ZnO films APL Mater. (IF 6.1) Pub Date : 2024-04-24 Jiamin Liu, Zhikang Zhou, Honggang Gu, Jinlong Zhu, Hao Jiang, Shiyuan Liu
Strain engineering has been extensively explored to modulate the various intrinsic properties of flexible inorganic semiconductor films. However, experimental characterization of tensile and compressive strain-induced modulation of optoelectronic properties and their differences has not been easily implemented in flexible inorganic semiconductor films. Herein, the strain-dependent structural, optical
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A three-dimensional coupled structure triboelectric nanogenerator for vertical and horizontal mechanical energy harvesting and fitness gait monitoring APL Mater. (IF 6.1) Pub Date : 2024-04-24 Cheng Luo, Hai Li
Recently, the self-powered monitoring device used for wearable sensors has attracted attention from various industries. It is worth noting that previous self-powered sensors were mostly focused on unidirectional sensing and monitoring, and few sensors can achieve both longitudinal and transverse sensing functions simultaneously. Here, we designed an arched and stacked coupling structure triboelectric
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Modification of mono-layer MoS2 through post-deposition treatment and oxidation for enhanced optoelectronic properties APL Mater. (IF 6.1) Pub Date : 2024-04-22 Jonathan Rommelfangen, Marco A. Gonzalez-Angulo, Devendra Pareek, Levent Gütay, Phillip J. Dale, Alex Redinger
Precise control of the optical and electrical properties of mono-layer (ML) thin MoS2 is crucial for future applications in functional devices. Depending on the synthesis route and the post-deposition annealing protocols, the number of sulfur vacancies in the material is different, which has a profound impact on the properties of the 2D layer. Here, we show that the sulfur vacancy-rich ML MoS2 films
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Two-stage hydrothermal process driven visible light sensitive photocatalytic m-ZnWO4/m-WO3 heterojunction composite materials APL Mater. (IF 6.1) Pub Date : 2024-04-18 Sagarika Sahoo, A. Rebekah, Kee-Sun Lee
The current study reports on the facile two-step hydrothermal synthesis of heterojunction m-ZnWO4/m-WO3 composite powders for visible light sensitive photocatalytic applications. The ZnWO4 particles start crystallizing on the surface of the WO3 powder in the second stage of the reaction in a basic medium. The phases of the composite powders were confirmed using x-ray diffraction analysis. The monoclinic
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Direct neutron-diffraction-based measurement of magnetic order in brownmillerite SrCoO2.5 and La0.5Sr0.5CoO2.5 thin films APL Mater. (IF 6.1) Pub Date : 2024-04-18 William M. Postiglione, Jierui Liang, Nileena Nandakumaran, Lucca Figari, Adam A. Aczel, Chris Leighton
Epitaxial cobaltites have emerged as exemplary materials for electrochemical gating, in large part due to their topotactic perovskite (P) ↔ brownmillerite (BM) transformations. SrCoO3−δ, for example, can be cycled between metallic ferromagnetic P SrCoO3 and insulating BM SrCoO2.5, realizing exceptional modulation of electronic, thermal, and optical properties. It is often presumed that such cycling
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Properties and ceramic transformation of Si–Zr–O–C precursor ceramics with porous structure APL Mater. (IF 6.1) Pub Date : 2024-04-18 Jia Lin, Shuai Wang, Hua Jin, Shuyuan Cui, Rongwen Wang, Yihang Yang, Guimei Huang, Jinhuo Wang
The preparation of ceramic materials with complex porous structures through photopolymerization-based 3D printing requires the development of stable and printable slurries. In this study, zirconium acetylacetonate was incorporated into the thiol vinyl organosilicon prepolymer to create a photosensitive Si–Zr–O–C slurry. Regarding the natural bone structures and the Tyson polygon principle, a gradient
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Ultrafast THz emission spectroscopy of spin currents in the metamagnet FeRh APL Mater. (IF 6.1) Pub Date : 2024-04-18 Yinchuan Lv, Soho Shim, Jonathan Gibbons, Axel Hoffmann, Nadya Mason, Fahad Mahmood
Heterostructures of ferromagnetic (FM) and noble metal (NM) thin films have recently attracted considerable interest as viable platforms for the ultrafast generation, control, and transduction of light-induced spin currents. In such systems, an ultrafast laser can generate a transient spin current in the FM layer, which is then converted to a charge current at the FM/NM interface due to strong spin–orbit
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Willis coupling in one-dimensional poroelastic laminates APL Mater. (IF 6.1) Pub Date : 2024-04-17 J.-P. Groby, M. R. Haberman
We employ the Baker–Campbell–Hausdorff formula to derive closed-form expressions for the effective properties, including emergent Willis coupling, of a one-dimensional heterogeneous poroelastic medium consisting of a periodically repeating two-layer unit-cell. In contrast to the elastic and fluidic analogs, the Willis coupling of this periodic poroelastic medium does not vanish in the low-frequency
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Effect of fabrication processes on BaTiO3 capacitor properties APL Mater. (IF 6.1) Pub Date : 2024-04-15 Yizhe Jiang, Zishen Tian, Pravin Kavle, Hao Pan, Lane W. Martin
There is an increasing desire to utilize complex functional electronic materials such as ferroelectrics in next-generation microelectronics. As new materials are considered or introduced in this capacity, an understanding of how we can process these materials into those devices must be developed. Here, the effect of different fabrication processes on the ferroelectric and related properties of prototypical
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3D printed polyvinylpyrrolidone–honey-gel with adhesive and degradable ability applied as bio-tape APL Mater. (IF 6.1) Pub Date : 2024-04-15 Shilong Hu, Yan Liu, Zhengzhou Yin, Husheng Chen, Yuan Jin, Aibing Zhang, Minghua Zhang, Licheng Hua, Jianke Du, Guangyong Li
This study explored the development of polyvinylpyrrolidone (PVP)–honey-gel (PHG) through 3D printing, aiming to develop a multifunctional bio-tape with adhesive and degradable properties. Based on the potential of honey to promote wound healing due to its antibacterial and anti-inflammatory properties, a PVP–honey-based 3D printing ink was developed by combining honey and PVP to create PHG through
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Kinetic inductance in superconducting CoSi2 coplanar microwave transmission lines APL Mater. (IF 6.1) Pub Date : 2024-04-15 Ekaterina Mukhanova, Weijun Zeng, Elica Anne Heredia, Chun-Wei Wu, Ilari Lilja, Juhn-Jong Lin, Sheng-Shiuan Yeh, Pertti Hakonen
We have looked into cobalt disilicide (CoSi2) as a potential building block for superconducting quantum circuits. In order to achieve this, we annealed a thin layer of Co to create microwave cavities with thickness of d = 10–105 nm from CoSi2 embedded in the silicon substrate. The cavity properties were measured as a function of temperature and power. In the films measuring 10 and 25 nm, we find a
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Phase coexistence induced surface roughness in V2O3/Ni magnetic heterostructures APL Mater. (IF 6.1) Pub Date : 2024-04-15 K. Ignatova, E. Vlasov, S. D. Seddon, N. Gauquelin, J. Verbeeck, D. Wermeille, S. Bals, T. P. A. Hase, U. B. Arnalds
We present an investigation of the microstructure changes in V2O3 as it goes through its inherent structural phase transition. Using V2O3 films with a well-defined crystal structure deposited by reactive magnetron sputtering on r-plane Al2O3 substrates, we study the phase coexistence region and its impact on the surface roughness of the films and the magnetic properties of overlying Ni magnetic layers
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Magnetic anisotropy driven by ligand in 4d transition-metal oxide SrRuO3 APL Mater. (IF 6.1) Pub Date : 2024-04-15 Yuki K. Wakabayashi, Masaki Kobayashi, Yuichi Seki, Yoshinori Kotani, Takuo Ohkochi, Kohei Yamagami, Miho Kitamura, Yoshitaka Taniyasu, Yoshiharu Krockenberger, Hideki Yamamoto
The origin of magnetic anisotropy in magnetic compounds is a longstanding issue in materials science, and nonmagnetic ligand ions are considered to contribute little to magnetic anisotropy. Here, we introduce the concept of ligand-driven magnetic anisotropy in a complex transition-metal oxide. We conducted x-ray magnetic circular dichroism spectroscopies at the Ru and O edges in the 4d ferromagnetic
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Precise density measurements of refractory metals over 3000 K: Revisiting UV imaging technique at ultrahigh temperatures APL Mater. (IF 6.1) Pub Date : 2024-04-11 Lei Wang, Yong Chan Cho, Nhat Thi Huu Le, Yun-Hee Lee, Geun Woo Lee
Precise density and thermal expansion measurements of refractory materials are extremely challenging due to the chemical reactions and thermal gradients at ultrahigh temperatures. The UV image technique has been successfully applied to the density measurements at high temperatures above 3000 K. However, intense radiation from the sample can blur the edge of the sample image, leading to uncertain measurements
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A new class of single-phase multiferroics: Bismuth-based layered supercell oxide thin films—Current progress and future perspectives APL Mater. (IF 6.1) Pub Date : 2024-04-11 Jianan Shen, James P. Barnard, Haiyan Wang
Multiferroic materials, where ferroelectric and magnetic orders coexist, have ignited substantial research interest due to the achievable manipulation of magnetic orders using external electric fields, a feature that has garnered serious interest for memory storage applications. Nonetheless, naturally occurring single-phase multiferroic materials are scarce, thus constraining options for practical
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Non-coplanar spin structure in a metallic thin film of triangular lattice antiferromagnet CrSe APL Mater. (IF 6.1) Pub Date : 2024-04-10 Yusuke Tajima, Junichi Shiogai, Kohei Ueda, Hirotake Suzaki, Kensuke Takaki, Takeshi Seki, Kazutaka Kudo, Jobu Matsuno
An antiferromagnetic metal with a two-dimensional triangular network offers a unique playground of intriguing magneto-transport properties and functionalities stemming from the interplay between conducting electrons and intricate magnetic phases. A NiAs-type CrSe is one of the candidates owing to alternate stackings of Cr and Se triangular atomic networks in its crystal structure. While the fabrication
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Epitaxial growth of α-(AlxGa1−x)2O3 by suboxide molecular-beam epitaxy at 1 µm/h APL Mater. (IF 6.1) Pub Date : 2024-04-10 Jacob Steele, Kathy Azizie, Naomi Pieczulewski, Yunjo Kim, Shin Mou, Thaddeus J. Asel, Adam T. Neal, Debdeep Jena, Huili G. Xing, David A. Muller, Takeyoshi Onuma, Darrell G. Schlom
We report the use of suboxide molecular-beam epitaxy (S-MBE) to grow α-(AlxGa1−x)2O3 films on (110) sapphire substrates over the 0 < x < 0.95 range of aluminum content. In S-MBE, 99.98% of the gallium-containing molecular beam arrives at the substrate in a preoxidized form as gallium suboxide (Ga2O). This bypasses the rate-limiting step of conventional MBE for the growth of gallium oxide (Ga2O3) from
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Interpretably learning the critical temperature of superconductors: Electron concentration and feature dimensionality reduction APL Mater. (IF 6.1) Pub Date : 2024-04-05 Ángel Díaz Carral, Martín Roitegui, Maria Fyta
A machine learning model for predicting the critical temperature of novel superconductors is proposed. The novelty of this approach is based solely on the choice of ab initio features, that is, descriptors directly and solely related to the electronic and atomic information of the single elements that chemically bond to form superconductors. We could show that selecting features, such as the electron
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Intrinsic room-temperature ferromagnetism in two-dimensional ternary transition metal tellurides CrX2Te4 (X = Al, Ga, and In) APL Mater. (IF 6.1) Pub Date : 2024-04-05 He Huang, Yanzhe Zhao, Zeyu Zhang, Liming Wang, Yanfei Wu, Chuang Liu, Jiapeng Zhao, Guanxiong Qiao, Jingyan Zhang, Xinqi Zheng, Shiming Zhou, Shouguo Wang
A tremendous amount of research has witnessed the exploration of two-dimensional (2D) materials with intrinsic ferromagnetism and diverse physical properties. However, the low Curie temperature and deficient magnetic anisotropy hinder their practical applications in nanoscale spintronics. Based on first-principles calculations, we propose a new family of 2D ternary transition metal tellurides, CrX2Te4
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Keldysh crossover in one-dimensional Mott insulators APL Mater. (IF 6.1) Pub Date : 2024-04-05 Kazuya Shinjo, Takami Tohyama
Recent advancements in pulse laser technology have facilitated the exploration of nonequilibrium spectroscopy of electronic states in the presence of strong electric fields across a broad range of photon energies. The Keldysh crossover serves as an indicator that distinguishes between excitations resulting from photon absorption triggered by near-infrared multicycle pulses and those arising from quantum
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Imperfect phononic crystals work too: The effect of translational and mid-plane symmetry breaking on hypersound propagation APL Mater. (IF 6.1) Pub Date : 2024-04-05 Visnja Babacic, Marianna Sledzinska, Thomas Vasileiadis, Clivia M. Sotomayor Torres, Bartlomiej Graczykowski
Translationally symmetric nanostructures, termed phononic crystals (PnCs), offer control over the propagation of acoustic phonons in the gigahertz (GHz) range for signal-processing applications and thermal management at sub-Kelvin temperatures. In this work, we utilize Brillouin light scattering to investigate the impact of symmetry breaking on GHz phonon propagation in PnCs made of holey silicon nanomembranes
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State of the art, trends, and opportunities for oxide epitaxy APL Mater. (IF 6.1) Pub Date : 2024-04-05 F. V. E. Hensling, W. Braun, D. Y. Kim, L. N. Majer, S. Smink, B. D. Faeth, J. Mannhart
Oxides have attracted enormous attention for both application-driven and fundamental solid-state research owing to their broad range of unusual and unique properties. Oxides play an important role in countless applications, e.g., as catalysts or functional materials in electronic devices. The ability to produce high-quality epitaxial films is often crucial for these purposes. Various approaches to
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Artificial tactile system for pressure monitoring in extracorporeal circulation processes APL Mater. (IF 6.1) Pub Date : 2024-04-05 Zhenhua Ji, Shang Yang, Guoning Shi, Ting Wu
Current intraoperative pressure monitoring methods still face significant limitations in perception and feedback, struggling to strike a balance between precision and wearable flexibility. Inspired by biological skin, we propose a biomimetic tactile sensing system for pressure monitoring during extracorporeal circulation, comprising flexible pressure sensors and artificial synaptic transistors. Aimed
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Ferromagnetic materials for Josephson π junctions APL Mater. (IF 6.1) Pub Date : 2024-04-04 Norman O. Birge, Nathan Satchell
The past two decades have seen an explosion of work on Josephson junctions containing ferromagnetic materials. Such junctions are under consideration for applications in digital superconducting logic and memory. In the presence of the exchange field, spin–singlet Cooper pairs from conventional superconductors undergo rapid phase oscillations as they propagate through a ferromagnetic material. As a
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Effect of inclined Lorentzian force on radiated nanoflow Williamson model under asymmetric energy source/sink: Keller box method APL Mater. (IF 6.1) Pub Date : 2024-04-04 VinothKumar B, Poornima T, Sreenivasulu P, Subba Rao A
An asymmetric energy source/sink can be designed to efficiently convert ambient energy into usable forms; this could have applications in micro-/nanoscale power generation, i.e., energy harvesting. The asymmetric energy source/sink and inclined Lorentzian force could be used to control the flow of fluids within these devices. This study numerically investigates the model of a Williamson nanofluid influenced
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Seashell-inspired polarization-sensitive tonotopic metasensor APL Mater. (IF 6.1) Pub Date : 2024-04-04 Y. Liu, V. F. Dal Poggetto, A. S. Gliozzi, N. M. Pugno, F. Bosia, M. Tortello
Bioinspiration has widely been demonstrated to be a powerful approach for the design of innovative structures and devices. Recently, this concept has been extended to the field of elasticity, dynamics, and metamaterials. In this paper, we propose a seashell-inspired metasensor that can simultaneously perform spatial frequency mapping and act as a polarizer. The structure emerges from a universal parametric
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Enhanced interlayer Dzyaloshinskii–Moriya interaction and field-free switching in magnetic trilayers with orthogonal magnetization APL Mater. (IF 6.1) Pub Date : 2024-04-04 Xupeng Zhao, Hongli Sun, Rongkun Han, Hongrui Qin, Lianjun Wen, Hailong Wang, Dahai Wei, Jianhua Zhao
The indirect interlayer exchange coupling (IEC) between two magnetic layers holds significant importance in the field of spintronics and has been widely used in the construction of synthetic antiferromagnets. Recently, the interlayer Dzyaloshinskii–Moriya interaction (DMI), antisymmetric counterpart of IEC, has been discovered in magnetic trilayers with a heavy-metal spacer. In this study, we present
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Elliptic pillars based metasurface for elastic waves focusing in a plate APL Mater. (IF 6.1) Pub Date : 2024-04-01 L. Carpentier, A. Gueddida, G. Lévêque, R. Alcorta-Galvan, C. Croënne, M. Miniaci, B. Djafari-Rouhani, Y. Pennec
In this paper, the ability of a metasurface made of resonant elliptical pillars to focus flexural Lamb waves in the sub-wavelength regime is investigated. We report on the influence of the ellipticity parameter on the local resonances of the pillars, in particular the monopolar compressional and dipolar bending modes that are responsible for the desired focusing effect. We also discuss how the transmission
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Evolution of quantum spin sensing: From bench-scale ODMR to compact integrations APL Mater. (IF 6.1) Pub Date : 2024-04-01 Shahriar Esmaeili, Paul Schmalenberg, Songtao Wu, Yuqing Zhou, Sean Rodrigues, Naveed Hussain, Taishi Kimura, Yukihiro Tadokoro, Shougo Higashi, Debasish Banerjee, Ercan M. Dede
This paper provides a comprehensive review of quantum spin sensing with a focus on the nitrogen vacancy (NV) center in diamond. Beginning with the discovery of optically detected magnetic resonance in NV centers, we trace the evolution of this technology and its integration with complementary metal-oxide-semiconductor technology, marking a significant advancement in measurement science. The unique
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Methacrylated gelatin hydrogel conjugated with ε-polylysine and enriched with platelet-rich plasma for chronically infected wounds APL Mater. (IF 6.1) Pub Date : 2024-04-01 Peiyu Yan, Xiangru Chen, Xin He, Zhaoyang Liu, Jing Sun
While numerous hydrogel dressings are available for treating chronically infected wounds, their clinical application is impeded by intricate preparation processes, low mechanical strength, and frequent reliance on exogenous antimicrobial agents. The latter often leads to antibiotic misuse and compromises the bioactivity of cell growth-promoting substances. Therefore, the field of therapeutic treatment
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Dual circular complementary split ring resonator based metamaterial sensor with high sensitivity and quality factor for textile material detection APL Mater. (IF 6.1) Pub Date : 2024-03-28 Haitham Alsaif, Md. Rashedul Islam, Ahasanul Hoque, Mohamed S. Soliman, Md. Shabiul Islam, Mohammad Tariqul Islam
In this paper, a novel metamaterial sensor with excellent sensitivity and quality factor for microwave sensing applications is presented. The designed metamaterial sensor is assembled on a 1.575 mm thickness of low-cost dielectric substrate material (Rogers RT5880), and the copper is used as a resonator. Computer Simulation Technology version 2019 (CST-2019) software is employed to design and analyze
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Quantitative assessment of selenium diffusion and passivation in CdSeTe solar cells probed by spatially resolved cathodoluminescence APL Mater. (IF 6.1) Pub Date : 2024-03-26 Bérengère Frouin, Thomas Bidaud, Stefano Pirotta, Tursun Ablekim, John Moseley, Wyatt K. Metzger, Stéphane Collin
The introduction of selenium in CdSeTe/CdTe solar cells has led to improved device performances attributed to the passivation of bulk defects. In this work, high-resolution cathodoluminescence experiments are performed on a series of CdSeTe/CdTe thin films with different Se concentrations to quantify the mechanisms and the passivation role of Se. We demonstrate a universal dependence between the Se
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Synthesis of thin film infinite-layer nickelates by atomic hydrogen reduction: Clarifying the role of the capping layer APL Mater. (IF 6.1) Pub Date : 2024-03-25 C. T. Parzyck, V. Anil, Y. Wu, B. H. Goodge, M. Roddy, L. F. Kourkoutis, D. G. Schlom, K. M. Shen
We present an integrated procedure for the synthesis of infinite-layer nickelates using molecular-beam epitaxy with gas-phase reduction by atomic hydrogen. We first discuss challenges in the growth and characterization of perovskite NdNiO3/SrTiO3, arising from post growth crack formation in stoichiometric films. We then detail a procedure for fully reducing NdNiO3 films to the infinite-layer phase
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Tunable cold/warm white light emission from Bi3+/Te4+ co-doped Cs2ZrCl6 perovskite phosphors APL Mater. (IF 6.1) Pub Date : 2024-03-25 Shaolong Liu, Wenfeng Sun, Jingxuan He, Xia Xiang
Combining a single-component white-light phosphor with ultraviolet light emitting diode chips emerges as a promising method to produce white-light-emitting diodes (WLEDs). Nevertheless, it is still a challenge for synthesizing single-component white-light phosphors with a high color rendering index (CRI). Herein, Bi3+/Te4+ co-doped Cs2ZrCl6 perovskite white-light phosphor is presented with a high CRI
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Enhanced orbital torque efficiency in nonequilibrium Ru50Mo50(0001) alloy epitaxial thin films APL Mater. (IF 6.1) Pub Date : 2024-03-25 Ke Tang, Cong He, Zhenchao Wen, Hiroaki Sukegawa, Tadakatsu Ohkubo, Yukio Nozaki, Seiji Mitani
Epitaxial thin films of fully nonequilibrium hcp-Ru50Mo50(0001) nanoalloys were prepared as a chemically disordered alloy, in which the intrinsic spin Hall effect is expected to be negligible. Structural analyses confirmed the epitaxial growth and atomic scale alloying of the films. In contrast to a tiny torque efficiency (ξDL) of ∼0.4% for Ru50Mo50/CoFeB, the ξDL for the Ru50Mo50/Ni heterostructure
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Underwater double vortex generation using 3D printed acoustic lens and field multiplexing APL Mater. (IF 6.1) Pub Date : 2024-03-25 Chadi Ellouzi, Ali Zabihi, Farhood Aghdasi, Aidan Kayes, Milton Rivera, Jiaxin Zhong, Amir Miri, Chen Shen
The generation of acoustic vortex beams has attracted an increasing amount of research attention in recent years, offering a range of functions, including acoustic communication, particle manipulation, and biomedical ultrasound. However, incorporating more vortices and broadening the capacity of these beams and associated devices in three dimensions pose challenges. Traditional methods often necessitate
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A pipe arrangement structure triboelectric nanogenerator for mechanical energy harvesting and sports training monitoring APL Mater. (IF 6.1) Pub Date : 2024-03-25 Zhiyuan Duan, Nan Ge, Cho Hong-Kwan, Song Sin-Young
Recently, intelligent wearable sensors applied in the field of smart sports have attracted much attention. Hence, we designed a pipe arrangement structure triboelectric nanogenerator (PA-TENG), and it can obtain mechanical energy and monitor sports motion. The triboelectric materials are composed of a polydimethylsiloxane layer attached to a silicone tube and nylon layer. The conductive copper attached
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A review: Comprehensive investigation on bandgap engineering under high pressure utilizing microscopic UV–Vis absorption spectroscopy APL Mater. (IF 6.1) Pub Date : 2024-03-19 Lin Chen, Zhijian Gao, Qian Li, Chuanxin Yan, Haiwa Zhang, Yinwei Li, Cailong Liu
Bandgap engineering plays a vital role in material development and device optimization due to its significant impact on the photovoltaic and photoelectricity properties of materials. Nevertheless, it is still a great challenge to accurately control the bandgap of semiconductors to achieve the targeted properties of materials. Recently, pressure-induced bandgap regulation has emerged as a novel and
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A comprehensive exploration of structural and electronic properties of molybdenum clusters APL Mater. (IF 6.1) Pub Date : 2024-03-19 Yao Wei, Valera Veryazov, Lev Kantorovich
Molybdenum clusters, characterized by their unique structure and intriguing catalytic properties, have gained significant attention in recent years. In several existing studies, density functional theory (DFT) methods have been used to find the lowest energy Mo clusters and explore their electronic and magnetic structure. In all cases, with the exception of a single recent study, where a genetic algorithm
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Tuning the luminescence color of Eu3+- and alkali-ion-codoped Sr2CaWO6 orange-red phosphors: Eu3+ site distribution and site-selective photoluminescence studies APL Mater. (IF 6.1) Pub Date : 2024-03-19 Takahito Otsuka, Ryohei Oka, Maria Rita Cicconi, Dominique de Ligny, Tomokatsu Hayakawa
In this study, Eu3+- and alkali-ion (M+)-codoped Sr2CaWO6:x (Eu3+, M+) (x = 0.01–0.10) were synthesized via a solid-state reaction. The effects of different Sr/Ca ratios, types of monovalent metal ions (M+ = Na+, K+, and Li+), and doping concentrations were systematically investigated. The crystalline phase, photoluminescence (PL) properties, lattice site occupied by the Eu3+ ion, Eu3+ site distribution
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Revealing the impact of ammonium ions from different low-dimensional perovskite structures on the film formation and degradation mechanism of FAPbI3 via sequential deposition APL Mater. (IF 6.1) Pub Date : 2024-03-19 Yafei Wang, Shihao Yuan, Rongsen Feng, Zecheng Diao, Jie Huang, Jiacai Liao, Siraj Sidhik, Xinting Shuai, Meicong Wang, Tao Zou, Zhongwei Liang, Ting Zhang, Aditya D. Mohite, Shibin Li
In recent years, the organic–inorganic hybrid perovskite community has been widely employed as the photo-active layer in optical-electronic devices. The black α-phase formamidinium lead iodide (FAPbI3) is the most popular perovskite for realizing high-efficiency solar cells due to its suitable bandgap. However, the issue of stability is also a concern in the research on FAPbI3 solar cells. In this
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Sustained robust exciton emission in suspended monolayer WSe2 within the low carrier density regime for quantum emitter applications APL Mater. (IF 6.1) Pub Date : 2024-03-18 Zheng-Zhe Chen, Chiao-Yun Chang, Ya-Ting Tsai, Po-Cheng Tsai, Shih-Yen Lin, Min-Hsiung Shih
The development of semiconductor optoelectronic devices is moving toward low power consumption and miniaturization, especially for high-efficiency quantum emitters. However, most of these quantum sources work at low carrier density regions, where the Shockley–Read–Hall (SRH) recombination may be dominant and seriously reduce the emission efficiency. In order to reduce the effect of carrier trapping
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Size-tunable and monodisperse lead sulfide quantum dots for broadband photodetectors APL Mater. (IF 6.1) Pub Date : 2024-03-18 Yujuan Fu, Yujiao Wang, Jijie Zhao, Shuai Wen, Huan Liu, Qing Li, Boao Gu, Lier Deng
Lead sulfide quantum dots (PbS QDs) are used in broadband photodetectors due to their excellent size tunability, photosensitivity, and solution processability. However, due to the risk of Ostwald ripening, synthesizing high-quality PbS QDs with absorption peaks over 2000 nm with high monodispersity is a challenge. In this study, by controlling the molar ratio of Pb to S and the number of injections
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Mapping orthorhombic domains with geometrical phase analysis in rare-earth nickelate heterostructures APL Mater. (IF 6.1) Pub Date : 2024-03-15 Bernat Mundet, Marios Hadjimichael, Jennifer Fowlie, Lukas Korosec, Lucia Varbaro, Claribel Domínguez, Jean-Marc Triscone, Duncan T. L. Alexander
Most perovskite oxides belong to the Pbnm space group, composed of an anisotropic unit cell, A-site antipolar displacements, and oxygen octahedral tilts. Mapping the orientation of the orthorhombic unit cell in epitaxial heterostructures that consist of at least one Pbnm compound is often needed for understanding and controlling the different degrees of coupling established at their coherent interfaces
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Electronic and optical properties of disordered getchellite: A photoreflectance, optical absorption, photoemission, and theoretical investigation APL Mater. (IF 6.1) Pub Date : 2024-03-15 Agata Sabik, Miłosz Grodzicki, Maciej P. Polak, Sandeep Gorantla, Alicja Bachmatiuk, Robert Kudrawiec, Wojciech M. Linhart
In this work, the optoelectronic properties of the getchellite crystal, a layered semiconducting disordered alloy with the chemical formula AsSbS3, are probed by a combination of complementary spectroscopic techniques, i.e., x-ray photoelectron spectroscopy together with a photoreflectance and a transmission spectroscopy. The experimental results are supported by a calculation based on density functional
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Magnetic functionalization and catalytic behavior of magnetic nanoparticles during laser photochemical graphitization of polyimide APL Mater. (IF 6.1) Pub Date : 2024-03-15 Abhishek Sarkar, Ho-won Noh, Ikenna C. Nlebedim, Pranav Shrotriya
We report laser-assisted photochemical graphitization of polyimides (PIs) into functional magnetic nanocomposites using laser irradiation of PI in the presence of magnetite nanoparticles (MNPs). PI Kapton sheets covered with MNP were photochemically treated under ambient conditions using a picosecond pulsed laser (1064 nm) to obtain an electrically conductive material. Scanning electron microscopy
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Enhancement of localized superconductivity in BaFe2As2 films via Co-ion implantation APL Mater. (IF 6.1) Pub Date : 2024-03-14 Myeongjun Oh, Jongmin Lee, Woun Kang, Sanghan Lee, Younjung Jo
In this study, we present a novel approach to localized superconductivity induction in BaFe2As2 films via targeted implantation of cobalt (Co) ions. Primarily, our study focuses on the systematic distribution of Co ions and the subsequent evolution of superconducting properties in Co-ion-implanted BaFe2As2 films. Our observations show that Co-ion distribution in the films is congruent with the results
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Incident beam current impact on space-charge retention in electron dynamitron irradiated polymethyl methacrylate APL Mater. (IF 6.1) Pub Date : 2024-03-14 Kathryn M. Sturge, Noah Hoppis, Aneesh Anandanatarajan, Ariana M. Bussio, Bryson C. Clifford, Emily H. Frashure, Miriam E. Hiebert, James E. Krutzler, Timothy W. Koeth
Dielectric charging aboard spacecraft and satellites is a persistent and pressing issue in materials design and applications. This study investigated the effect of electron irradiation on charge trapping and leakage properties in polymethyl methacrylate, which is necessary for determining the maximum permissible fluence of radiation before the material is pushed beyond its breakdown threshold in charged
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Pillararene-based donor–acceptor complex for ferroelectric self-assembled supramolecular materials APL Mater. (IF 6.1) Pub Date : 2024-03-13 Shuai Cao, Leqian Song, Yangyang Zheng, Kim Truc Nguyen, Huacheng Zhang, Jie Han
The investigation of ferroelectric materials is an important aspect of condensed matter physics. Compared to the traditional inorganic ferroelectric ones, organic ferroelectric materials possess unique advantages, including light weight, scalability, flexibility, and solvent treatability. However, the study of organic ferroelectric materials is still in its infancy, especially from the view of supramolecular
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Rapid coating of polyamide, polyurea, and polythiourea on metal–organic framework surfaces APL Mater. (IF 6.1) Pub Date : 2024-03-12 Yunmei Huang, Anheng Qi, Siqi Li, Lu Tang, Yingbo Zhao, Tao Li
Well-defined metal–organic framework (MOF)@polymer core–shell composite particles with polyamide, polyurea, and polythiourea as the shell layer have been constructed for the first time using non-solvent-induced surface-aimed polymerization. This surface polymerization method utilizes non-solvent-induced phase separation to concentrate and direct monomers onto MOF particle surfaces, thus completing
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Redox-active cerium-based metal–organic layers coordinated on carbon nanotubes as materials for supercapacitors APL Mater. (IF 6.1) Pub Date : 2024-03-12 Kuan-Chu Wu, Meng-Dian Tsai, Chung-Huan Wu, Tzu-Hsien Yang, You-Liang Chen, Chung-Wei Kung
In this work, the redox-active, two-dimensional (2D), and highly dispersible metal–organic layers (MOLs) constructed from hexa-cerium(IV) clusters, CeBTB (BTB = 1,3,5-benzenetribenzoate), were directly coordinated onto the surface of carboxylic acid-functionalized multi-walled carbon nanotubes (CNTs) by utilizing a post-synthetically grafting approach. Nanocomposites with various MOL-to-CNT ratios
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Formation of oxygen vacancy at surfaces of ZnO by trimethylaluminum APL Mater. (IF 6.1) Pub Date : 2024-03-12 Hyobin Eom, Woojin Bae, Ju Young Sung, Ji Hyeon Choi, Kyun Seong Dae, Jae Hyuck Jang, Tae Joo Park, Sang Woon Lee, Bonggeun Shong
The two-dimensional electron gas (2DEG) is a group of electrons that can move freely in horizontal dimensions but are confined in the third direction. It has been reported that atomic layer deposition (ALD) of Al2O3 on various reducible n-type oxides can lead to the formation of 2DEG at the heterojunction interfaces, among which ZnO is known to provide promising properties. In this study, we have performed
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Physics based optical modeling of iron disulfide thin films APL Mater. (IF 6.1) Pub Date : 2024-03-12 Awais Zaka, Sabina Abdul Hadi, Pratibha Pal, Dayanand Kumar, Nazek El-Atab, Saeed Alhassan, Ammar Nayfeh
In this work, physics based optical modeling is carried out using iron disulfide thin films deposited by using a plasma-assisted, radio frequency-powered technique. Iron disulfide is a transition metal dichalcogenide material, exhibiting a variety of unique and excellent characteristics. Various characterization techniques are employed to examine the growth rate, film thickness, and behavior of as-grown
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Strength degradation of GFRP cross-ply laminates in hydrothermal conditions APL Mater. (IF 6.1) Pub Date : 2024-03-12 Wen Cheng, Yan Cao
The changes in mechanical properties of glass fiber reinforced plastic cross-ply laminates as a result of hydrothermal aging were studied theoretically. The composite specimens have been immersed in distilled water at 25, 40, and 70 °C for 60 days for aging testing. Based on Fick’s law and the Arrhenius theorem, the moisture absorption data under different environments was analyzed, and the method
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Gradient index metamaterials for broadband underwater sound absorption APL Mater. (IF 6.1) Pub Date : 2024-03-08 Xiao Pan, Xinsheng Fang, Xuewen Yin, Yan Li, Yongdong Pan, Yabin Jin
The underwater broadband anechoic coating is highly demanded in acoustic stealth for underwater vehicles. In this work, we propose a gradient index metamaterial for broadband underwater sound absorption, which is further experimentally validated under high pressure conditions. The gradient index metamaterial consisting of radius-varied cavities in rubber allows the sound waves to follow the objective
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Accurate evaluation method for HRS retention of VCM ReRAM APL Mater. (IF 6.1) Pub Date : 2024-03-08 N. Kopperberg, D. J. Wouters, R. Waser, S. Menzel, S. Wiefels
Long-term retention is one of the major challenges concerning the reliability of redox-based resistive switching random access memories based on the valence change mechanism (VCM). The stability of the programmed state has to be ensured over several years, leaving a sufficient read window between the states, which is even more challenging at large statistics. Thus, the underlying physical mechanisms
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Observation of maxon-like ultrasound in elastic metabeam APL Mater. (IF 6.1) Pub Date : 2024-03-07 Peng Zhang, Yunya Liu, Keping Zhang, Yuning Wu, Fei Chen, Yi Chen, Pai Wang, Xuan Zhu
We observe maxon-like dispersion of ultrasonic guided waves in elastic metamaterials consisting of a rectangular beam and an array of cylindrical resonators. The pillars act as asymmetric resonators that induce a strong modal hybridization. We experimentally observe the strongly localized maxon mode with zero group velocity. Our study also demonstrates a unique feature of the maxon with a down-shifting
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Pressure-induced emission enhancement: A review APL Mater. (IF 6.1) Pub Date : 2024-03-07 Boyu Zou, Yingxue Han, Zhihao Yang, Qinglin Wang, Guangyu Wang, Guozhao Zhang, Yinwei Li, Cailong Liu
The luminescent properties of some materials undergo significant changes under compression. High pressure generated by a diamond anvil cell (DAC) is often used as an external stimulus to explore the relationship between the structures and luminescent properties of materials, provide traceable color and structural changes, and quantify the environment in which the materials are located. Under high pressure
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Acoustic meta-stethoscope for cardiac auscultation APL Mater. (IF 6.1) Pub Date : 2024-03-06 Ruoxue Dai, Zhengji Chen, Jingjing Liu, Jing Yang, Bin Liang, Jian-Chun Cheng
Straight cylindrical stethoscopes serve as an important alternative to conventional stethoscopes, whose application in the treatment of infectious diseases might be limited by the use of protective clothing. Yet their miniaturization is challenging due to the long wavelength of low-frequency cardiac sounds. Here, we present and experimentally demonstrate an acoustic meta-stethoscope with subwavelength
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Effect of resonant acoustic powder mixing on delay time of W–KClO4–BaCrO4 mixtures APL Mater. (IF 6.1) Pub Date : 2024-03-06 Kyungmin Kwon, Seunghwan Ryu, Soyun Joo, Youngjoon Han, Donghyeon Baek, Moonsoo Park, Dongwon Kim, Seungbum Hong
This study investigates the impact of resonant acoustic powder mixing on the delay time of the W–KClO4–BaCrO4 (WKB) mixture and its potential implications for powder and material synthesis. Through thermal analysis, an inverse linear relationship was found between thermal conductivity and delay time, allowing us to use thermal conductivity as a reliable proxy for delay time. By comparing the thermal