Abstract

Composite films of (Cd \({}_{3}\) As \({}_{2}\) ) \({}_{100-X}\) (MnAs) \({}_{X}\) on silicon and sitall substrates with Mn concentration of 5.8–16.4 at \(\%\) were obtained by vacuum-thermal evaporation. The structural properties of the films were investigated by X-ray phase analysis and scanning electron microscopy. Magneto-optical properties were studied using the transverse Kerr effect (TKE) method in the energy range of 0.5–4.0 eV in magnetic fields up to 3 kOe at temperatures of 20–300 K. In the geometry of the transverse Kerr effect, the spectral, field, and temperature dependences of TKE were obtained. Analysis of experimental data showed that at Mn contents more than 12.9 at \(\%\) the films contain the \(\alpha^{\prime\prime}\) -phase of the topological Dirac semimetal Cd \({}_{3}\) As \({}_{2}\) in the form of large granules, as well as ferromagnetic MnAs granules. The Curie temperature of the films depends on their Mn content and is lower than that of bulk MnAs samples. At Mn contents in the film of 5.8 and 6.4 at \(\%\) , no magneto-optical response was detected, indicating the formation of a superparamagnetic state or a spin glass state at low Mn concentrations. At an Mn content in the film of 9.9 at \(\%\) , a significant change in magneto-optical spectra was observed, indicating the formation of MnAs nanoclusters and partial dissolution of Mn in the Cd \({}_{3}\) As \({}_{2}\) matrix.

中文翻译：

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(Cd $${}_{\boldsymbol{3}}$$ 作为 $${}_{\boldsymbol{2}}$$ ) $${}_{\boldsymbol{100-X 的磁光克尔光谱}}$$ (MnAs) $${}_{\boldsymbol{X}}$$ 复合材料

摘要

(Cd \({}_{3}\) As \({}_{2}\) ) \({}_{100-X}\) (MnAs) \({}_{X}复合薄膜\)在硅和 Sital 衬底上通过真空热蒸发获得，Mn 浓度为 5.8–16.4，\(\%\) 。通过X射线物相分析和扫描电子显微镜研究了薄膜的结构特性。使用横向克尔效应 (TKE) 方法在 0.5–4.0 eV 的能量范围内、在 20–300 K 温度下高达 3 kOe 的磁场中研究了磁光特性。在横向克尔效应的几何结构中，光谱获得了 TKE 的 、场和温度依赖性。实验数据分析表明，当 Mn 含量超过 12.9 （\%\）时，薄膜包含拓扑狄拉克半金属 Cd \({}_{的\(\alpha^{\prime\prime}\)相。 3}\)作为大颗粒形式的\({}_{2}\)，以及铁磁性MnAs颗粒。薄膜的居里温度取决于其 Mn 含量，并且低于块状 MnAs 样品的居里温度。当薄膜中​​Mn含量为5.8和6.4 （%）时，没有检测到磁光响应，表明在低Mn浓度下形成了超顺磁态或自旋玻璃态。当薄膜中​​ Mn 含量为 9.9 at \(\%\)时，观察到磁光光谱的显着变化，表明 MnAs 纳米团簇的形成以及 Mn 在 Cd \({}_{3}中的部分溶解\)作为\({}_{2}\)矩阵。