Temperature-dependent magnetic anisotropy in the layered magnetic semiconductors Cr I 3 and CrB r 3
Temperature-dependent magnetic anisotropy in the layered magnetic semiconductors Cr I 3 and CrB r 3
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DOI：
10.1103/physrevmaterials.2.024004
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发表时间：
2018-02
影响因子：
3.4
通讯作者：
Nils Richter;D. Weber;F. Martin;Nirpendra Singh;U. Schwingenschlögl;B. Lotsch;M. Kläui
中科院分区：
文献类型：
--
作者：
Nils Richter;D. Weber;F. Martin;Nirpendra Singh;U. Schwingenschlögl;B. Lotsch;M. Kläui
三卤化铬是层状和可剥落的半导体，并表现出不同寻常的磁性能和令人惊讶的磁化温度依赖性。通过分析$\mathrm{Cr}{\mathrm{I}}_{3}$的磁晶各向异性随温度的变化，我们发现${K}_{u}=300\ifmmode\pm\else\textpm\fi{50\phantom{\rule{4pt}{0ex}}\mathrm{kJ}/{\mathrm{m}}^{3}$在$5\phantom{\rule{4pt}{0ex}}\mathrm{K}$到${K}_{u}=43\ifmmode\pm\else\textpm\fi{7\phantom{\rule{4pt}{0ex}}\mathrm{m}}^{3}$在$60\phantom{\rule{4pt}{0ex}}\mathrm{K}$时，磁晶各向异性变化强烈，接近于居里温度。我们直接与$\mathrm{CrB}{\mathrm{r}}_{3}$进行比较，作为参考，我们发现结果与文献一致。特别是，我们发现碘化物化合物的各向异性变化比溴化物大3倍以上。我们使用经典模型分析了这种温度依赖性，表明各向异性常数在低于居里温度的任何给定温度下随磁化强度的变化而变化，表明温度依赖性可以用主要的单轴各向异性来解释，其中这种缩放是由于局部自旋簇具有热诱导磁化方向偏离总体磁化方向。
Chromium trihalides are layered and exfoliable semiconductors and exhibit unusual magnetic properties with a surprising temperature dependence of the magnetization. By analyzing the evolution of the magnetocrystalline anisotropy with temperature in chromium iodide $\mathrm{Cr}{\mathrm{I}}_{3}$, we find it strongly changes from ${K}_{u}=300\ifmmode\pm\else\textpm\fi{}50\phantom{\rule{4pt}{0ex}}\mathrm{kJ}/{\mathrm{m}}^{3}$ at $5\phantom{\rule{4pt}{0ex}}\mathrm{K}$ to ${K}_{u}=43\ifmmode\pm\else\textpm\fi{}7\phantom{\rule{4pt}{0ex}}\mathrm{kJ}/{\mathrm{m}}^{3}$ at $60\phantom{\rule{4pt}{0ex}}\mathrm{K}$, close to the Curie temperature. We draw a direct comparison to $\mathrm{CrB}{\mathrm{r}}_{3}$, which serves as a reference, and where we find results consistent with literature. In particular, we show that the anisotropy change in the iodide compound is more than 3 times larger than in the bromide. We analyze this temperature dependence using a classical model, showing that the anisotropy constant scales with the magnetization at any given temperature below the Curie temperature, indicating that the temperature dependence can be explained by a dominant uniaxial anisotropy where this scaling results from local spin clusters having thermally induced magnetization directions that deviate from the overall magnetization.