{"title":"Magneto–Optical Kerr Spectroscopy of (Cd $${}_{\\boldsymbol{3}}$$ As $${}_{\\boldsymbol{2}}$$ ) $${}_{\\boldsymbol{100-X}}$$ (MnAs) $${}_{\\boldsymbol{X}}$$ Composites","authors":"","doi":"10.3103/s0027134924700176","DOIUrl":null,"url":null,"abstract":"<span> <h3>Abstract</h3> <p>Composite films of (Cd<span> <span>\\({}_{3}\\)</span> </span>As<span> <span>\\({}_{2}\\)</span> </span>)<span> <span>\\({}_{100-X}\\)</span> </span>(MnAs)<span> <span>\\({}_{X}\\)</span> </span> on silicon and sitall substrates with Mn concentration of 5.8–16.4 at <span> <span>\\(\\%\\)</span> </span> 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 <span> <span>\\(\\%\\)</span> </span> the films contain the <span> <span>\\(\\alpha^{\\prime\\prime}\\)</span> </span>-phase of the topological Dirac semimetal Cd<span> <span>\\({}_{3}\\)</span> </span>As<span> <span>\\({}_{2}\\)</span> </span> 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 <span> <span>\\(\\%\\)</span> </span>, 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 <span> <span>\\(\\%\\)</span> </span>, a significant change in magneto-optical spectra was observed, indicating the formation of MnAs nanoclusters and partial dissolution of Mn in the Cd<span> <span>\\({}_{3}\\)</span> </span>As<span> <span>\\({}_{2}\\)</span> </span> matrix.</p> </span>","PeriodicalId":711,"journal":{"name":"Moscow University Physics Bulletin","volume":null,"pages":null},"PeriodicalIF":0.4000,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Moscow University Physics Bulletin","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.3103/s0027134924700176","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
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.
镉 $${}_{\boldsymbol{3}}$ As $${}_{\boldsymbol{2}}$ ) $${}_{\boldsymbol{100-X}}$ (MnAs) $${}_{\boldsymbol{X}}$ 复合材料的磁光学克尔光谱学
Abstract Composite films of (Cd \({}_{3}\) As \({}_{2}\) )\通过真空-热蒸发法在硅和sitall基底上获得了锰浓度为5.8-16.4的（{}_{100-X}）（MnAs）复合薄膜。通过 X 射线相分析和扫描电子显微镜研究了薄膜的结构特性。利用横向克尔效应（TKE）方法研究了在 20-300 K 温度下、磁场高达 3 kOe 的 0.5-4.0 eV 能量范围内的磁光特性。对实验数据的分析表明，当 Mn 含量超过 12.9%时，薄膜含有拓扑狄拉克半金属 Cd \({}_{3}\) As \({}_{2}\) 的 \(α^\prime\prime}\) -相，以大颗粒的形式存在，同时还含有铁磁性 MnAs 颗粒。薄膜的居里温度取决于其锰含量，并且低于块状 MnAs 样品的居里温度。当薄膜中的锰含量为 5.8 和 6.4 时，没有检测到磁光响应，这表明在低锰浓度下形成了超顺磁态或自旋玻璃态。当薄膜中的锰含量为 9.9 时，磁光光谱发生了显著变化，表明形成了锰砷纳米团簇，锰部分溶解在镉（{}_{3}\）砷（{}_{2}\）基体中。
期刊介绍：
Moscow University Physics Bulletin publishes original papers (reviews, articles, and brief communications) in the following fields of experimental and theoretical physics: theoretical and mathematical physics; physics of nuclei and elementary particles; radiophysics, electronics, acoustics; optics and spectroscopy; laser physics; condensed matter physics; chemical physics, physical kinetics, and plasma physics; biophysics and medical physics; astronomy, astrophysics, and cosmology; physics of the Earth’s, atmosphere, and hydrosphere.
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