反铁磁绝缘体和二维金属界面上移动域壁的自旋泵送

IF 1 4区 物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY
A. G. Mal’shukov
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引用次数: 0

摘要

摘要 与反铁磁绝缘体(AFMI)和二维金属之间的磁补偿界面平行移动的畴壁(DW)可以将自旋极化泵入金属。假设平行反铁磁绝缘体的局部自旋与巡回电子在界面上通过交换相互作用而相互作用。对于在随机杂质上经历电势和自旋轨道散射的电子,我们采用了格林函数的凯尔迪什形式主义。这种形式主义可以对二维电子气的自旋泵、自旋扩散和自旋弛豫效应进行统一分析。研究表明,非交错磁化泵入金属膜的过程与界面交换相互作用有关,为二阶。在自旋弛豫足够弱的情况下,这种泵浦效应可能比保利磁性的一阶效应强得多,而保利磁性是由 DW 的小非交错交换场产生的。研究表明,泵浦极化对电子费米面的几何形状很敏感,当交错磁化的波矢量接近费米面的嵌套矢量时,泵浦极化就会增加。在无序扩散电子气中,诱导自旋极化会跟随畴壁运动。自旋极化在畴壁周围不对称地分布,其距离可能比畴壁宽度大得多。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Spin Pumping by a Moving Domain Wall at the Interface of an Antiferromagnetic Insulator and a Two-Dimensional Metal

Spin Pumping by a Moving Domain Wall at the Interface of an Antiferromagnetic Insulator and a Two-Dimensional Metal

Spin Pumping by a Moving Domain Wall at the Interface of an Antiferromagnetic Insulator and a Two-Dimensional Metal

A domain wall (DW) which moves parallel to a magnetically compensated interface between an antiferromagnetic insulator (AFMI) and a two-dimensional (2D) metal can pump spin polarization into the metal. It is assumed that localized spins of a collinear AFMI interact with itinerant electrons through their exchange interaction on the interface. We employed the Keldysh formalism of Green’s functions for electrons which experience potential and spin-orbit scattering on random impurities. This formalism allows a unified analysis of spin pumping, spin diffusion and spin relaxation effects on a 2D electron gas. It is shown that the pumping of a nonstaggered magnetization into the metal film takes place in the second order with respect to the interface exchange interaction. At sufficiently weak spin relaxation this pumping effect can be much stronger than the first-order effect of the Pauli magnetism which is produced by the small nonstaggered exchange field of the DW. It is shown that the pumped polarization is sensitive to the geometry of the electron’s Fermi surface and increases when the wave vector of the staggered magnetization approaches the nesting vector of the Fermi surface. In a disordered diffusive electron gas the induced spin polarization follows the motion of the domain wall. It is distributed asymmetrically around the DW over a distance which can be much larger than the DW width.

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来源期刊
CiteScore
1.90
自引率
9.10%
发文量
130
审稿时长
3-6 weeks
期刊介绍: Journal of Experimental and Theoretical Physics is one of the most influential physics research journals. Originally based on Russia, this international journal now welcomes manuscripts from all countries in the English or Russian language. It publishes original papers on fundamental theoretical and experimental research in all fields of physics: from solids and liquids to elementary particles and astrophysics.
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