Exchange-driven spin Hall effect in anisotropic ferromagnets
Exchange-driven spin Hall effect in anisotropic ferromagnets
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DOI：
10.1103/physrevb.109.054409
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发表时间：
2023-10
影响因子：
3.7
通讯作者：
K. Belashchenko
中科院分区：
文献类型：
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作者：
K. Belashchenko
利用自旋相关电导率张量的晶体各向异性，可以在铁磁薄膜中产生横向自旋极化电流。这种铁磁自旋霍尔效应类似于交替磁体中的自旋分裂效应，不需要自旋轨道耦合。41个非立方铁磁体的第一性原理筛选表明，当它们作为倾斜晶体轴的单晶生长时，可以表现出与最佳自旋轨道驱动的自旋霍尔源相当的大自旋霍尔角。在一些低对称基底上生长的均匀磁化铁磁薄膜，具有防止不同取向域的贡献抵消的外延关系，可以实现宏观自旋霍尔效应。对于任何衬底，如果磁晶各向异性足够强，可以将磁化锁定在不同取向域的结晶轴上，则宏观响应也是可能的。
Crystallographic anisotropy of the spin-dependent conductivity tensor can be exploited to generate transverse spin-polarized current in a ferromagnetic film. This ferromagnetic spin Hall effect is analogous to the spin-splitting effect in altermagnets and does not require spin-orbit coupling. First-principles screening of 41 non-cubic ferromagnets revealed that many of them, when grown as a single crystal with tilted crystallographic axes, can exhibit large spin Hall angles comparable with the best available spin-orbit-driven spin Hall sources. Macroscopic spin Hall effect is possible for uniformly magnetized ferromagnetic films grown on some low-symmetry substrates with epitaxial relations that prevent cancellation of contributions from different orientation domains. Macroscopic response is also possible for any substrate if magnetocrystalline anisotropy is strong enough to lock the magnetization to the crystallographic axes in different orientation domains.