Green's function formalism for spin transport in metal-insulator-metal heterostructures
Green's function formalism for spin transport in metal-insulator-metal heterostructures
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DOI：
10.1103/physrevb.96.174422
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发表时间：
2017-09
影响因子：
3.7
通讯作者：
Jiansen Zheng;S. Bender;J. Armaitis;R. E. Troncoso;R. Duine
中科院分区：
文献类型：
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作者：
Jiansen Zheng;S. Bender;J. Armaitis;R. E. Troncoso;R. Duine
我们开发了一个绿色函数形式主义的自旋输运通过异质结构，包含金属铅和绝缘铁磁体。虽然这种形式主义原则上允许包含各种磁振相互作用，我们专注于吉尔伯特阻尼。作为一个应用，我们考虑弹道自旋输运的交换磁振子在金属-绝缘体-金属异质结与无障碍。对于前一种情况，我们表明，无序和吉尔伯特阻尼之间的相互作用导致自旋电流波动。对于无无序的情况，我们得到了自旋电流随铁磁体厚度的变化关系。此外，我们表明，绿色的函数形式主义的结果同意在清洁和连续极限与线性化随机Landau-Lifshitz-吉尔伯特方程。发达的绿色的功能形式主义是一个自然的出发点，在异质结构中，包含正常的金属和磁性绝缘体的磁振子输运的数值研究。
We develop a Green's function formalism for spin transport through heterostructures that contain metallic leads and insulating ferromagnets. While this formalism in principle allows for the inclusion of various magnonic interactions, we focus on Gilbert damping. As an application, we consider ballistic spin transport by exchange magnons in a metal-insulator-metal heterostructure with and without disorder. For the former case, we show that the interplay between disorder and Gilbert damping leads to spin current fluctuations. For the case without disorder, we obtain the dependence of the transmitted spin current on the thickness of the ferromagnet. Moreover, we show that the results of the Green's function formalism agree in the clean and continuum limit with those obtained from the linearized stochastic Landau-Lifshitz-Gilbert equation. The developed Green's function formalism is a natural starting point for numerical studies of magnon transport in heterostructures that contain normal metals and magnetic insulators.