基于Co₂Mn的赫斯勒薄膜在磁光克尔效应（MOKE）与布里渊光散射（BLS）中的磁光信号
Magneto-optical signal from $\mathrm{Co_2Mn}$-based Heusler thin films in MOKE and BLS
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中文总结 AI 辅助
本研究针对基于Co₂Mn的赫斯勒薄膜，采用MOKE与BLS技术分析其磁光响应，明确了不同组分薄膜的磁光效应差异，为该类材料的探测波长选择提供了指导。
中文摘要 AI 辅助
基于Co₂Mn的赫斯勒化合物为磁子学与自旋电子学提供了成分可调的多功能平台。其中半金属Co₂MnSi因具有极低的吉尔伯特阻尼，成为磁子学领域的重点研究对象，但其在可见光范围内的磁光响应较弱，给布里渊光散射（BLS）等光学探测带来挑战。本研究通过磁光克尔效应（MOKE）光谱与BLS，对Co₂MnX外延薄膜（X = {AlₓSi₁₋ₓ, GaₓGe₁₋ₓ, Sn}）的磁光响应展开研究。角分辨MOKE仅在Co₂MnSi中分辨出显著的、与波长相关的二次磁光克尔效应（QMOKE），而Co₂MnAl、Co₂MnGa与Co₂MnSn则主要呈现线性响应。对比两种波长下热磁子的BLS强度，Co₂MnSi在532nm处信号最弱，但在457nm处属于最强信号之列，这一结果与其克尔角的光谱依赖特性一致。这些研究结果强调了两种磁光技术之间的关联，为基于Co₂Mn的赫斯勒化合物的探测波长选择提供了指导。
英文摘要
$\mathrm{Co_2Mn}$-based Heusler compounds offer a versatile, composition-tunable platform for magnonics and spintronics. Among them, the half-metallic $\mathrm{Co_2MnSi}$ is of particular interest for magnonics owing to its ultralow Gilbert damping, yet its weak magneto-optical response in the visible challenges optical probing such as Brillouin light scattering (BLS). We study the magneto-optical response of epitaxial $\mathrm{Co_2Mn}X$ films ($X = \{\mathrm{Al}_x\mathrm{Si}_{1-x}, \mathrm{Ga}_x\mathrm{Ge}_{1-x}, \mathrm{Sn}\}$) by magneto-optical Kerr effect (MOKE) spectroscopy and BLS. Angle-resolved MOKE resolves a significant, wavelength-dependent quadratic MOKE (QMOKE) only for $\mathrm{Co_2MnSi}$, whereas $\mathrm{Co_2MnAl}$, $\mathrm{Co_2MnGa}$ and $\mathrm{Co_2MnSn}$ respond dominantly linearly. Comparing BLS intensities of thermal magnons at two wavelengths, $\mathrm{Co_2MnSi}$ gives the weakest signal at 532 nm yet among the strongest at 457 nm, tracking the spectral dependence of its Kerr angle. These results emphasise the relation between the two magneto-optical techniques, guiding the choice of probing wavelength for $\mathrm{Co_2Mn}$-based Heusler compounds.
