Spin pumping into anisotropic Dirac electrons
Spin pumping into anisotropic Dirac electrons
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DOI：
10.1103/physrevb.106.144418
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发表时间：
2022-06
影响因子：
3.7
通讯作者：
T. Funato;T. Kato;M. Matsuo
中科院分区：
文献类型：
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作者：
T. Funato;T. Kato;M. Matsuo
本文从理论上研究了微波辐射对相邻铁磁绝缘体诱导各向异性狄拉克电子系统的自旋抽运。我们利用与界面交换耦合有关的二阶微扰，阐述了由于自旋电流流入狄拉克电子系统而产生的吉尔伯特阻尼增强。作为一个例子，我们考虑在铋中实现的各向异性狄拉克系统，以表明吉尔伯特阻尼随铁磁绝缘体中的磁化方向而变化。我们的结果表明，这种设置可以为狄拉克电子系统的各向异性提供有用的信息。
We study spin pumping into an anisotropic Dirac electron system induced by microwave irra-diation to an adjacent ferromagnetic insulator theoretically. We formulate the Gilbert damping enhancement due to the spin current flowing into the Dirac electron system using second-order perturbation with respect to the interfacial exchange coupling. As an illustration, we consider the anisotropic Dirac system realized in bismuth to show that the Gilbert damping varies according to the magnetization direction in the ferromagnetic insulator. Our results indicate that this setup can provide helpful information on the anisotropy of the Dirac electron system.