Theoretical study on anisotropic magnetoresistance effect for weak ferromagnets with a crystal field of tetragonal symmetry
Theoretical study on anisotropic magnetoresistance effect for weak ferromagnets with a crystal field of tetragonal symmetry
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DOI：
10.1016/j.matpr.2020.05.224
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发表时间：
2020-06
期刊：
影响因子：
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通讯作者：
S. Kokado;M. Tsunoda
中科院分区：
文献类型：
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作者：
S. Kokado;M. Tsunoda
利用电子散射理论，推导出具有四方对称晶场的弱铁磁体各向异性磁阻比的表达式。该理论基于双电流模型，该模型由一个导电态和具有自旋-轨道相互作用的局域d态和晶格场组成。AMR比的表示与每个轨道在费米能级的偏态密度有关。在此基础上，我们研究了AMR比的符号。此外，我们还分析了一种典型的弱铁磁体bcc-Fe的低温负AMR比的实验结果。
We derive an expression of the anisotropic magnetoresistance (AMR) ratio for weak ferromagnets with a crystal field of tetragonal symmetry using the electron scattering theory. This theory is based on the two-current model consisting of a conduction state and localized d states with a spin-orbit interaction and the crystal field. The expression of the AMR ratio is related to the partial density of states of each orbital at the Fermi energy. On the basis of this expression, we investigate the sign of the AMR ratio. In addition, we analyze the experimental result of the negative AMR ratio at low temperature for a typical weak ferromagnet, bcc Fe.