Phonons and magnons are prospective information carriers to substitute the transfer of charge in nanoscale communication devices. Our ability to manipulate them at the nanoscale and with ultimate speed is examined by ultrafast acoustics and femtosecond optomagnetism, which use ultrashort laser pulses for generation and detection of the corresponding coherent excitations. Ultrafast magnetoacoustics merges these research directions and focuses on the interaction of optically generated coherent phonons and magnons. In this review, we present ultrafast magnetoacoustic experiments with nanostructures based on the alloy (Fe,Ga) known as Galfenol. We demonstrate how broad we can manipulate the magnetic response on an optical excitation by controlling the spectrum of generated coherent phonons and their interaction with magnons. Resonant phonon pumping of magnons, formation of magnon polarons, driving of a magnetization wave by a guided phonon wavepacket are demonstrated. The presented experimental results have great application potential in emerging areas of modern nanoelectronics.

中文翻译：

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Galfenol 纳米结构中的超快磁声学

声子和磁子是有望替代纳米级通信设备中电荷传输的信息载体。我们通过超快声学和飞秒光磁来检验我们在纳米尺度上以极限速度操纵它们的能力，它们使用超短激光脉冲来生成和检测相应的相干激发。超快磁声学融合了这些研究方向，重点研究光学产生的相干声子和磁振子的相互作用。在这篇综述中，我们提出了基于称为 Galfenol 的合金（Fe、Ga）的纳米结构的超快磁声实验。我们展示了通过控制生成的相干声子的光谱及其与磁振子的相互作用，我们可以在多大范围内操纵光学激发下的磁响应。演示了磁振子的共振声子泵浦、磁振子极化子的形成、引导声子波包驱动磁化波。所提出的实验结果在现代纳米电子学的新兴领域具有巨大的应用潜力。