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Spin-Motive Forces and Coulomb Interaction in a Ferromagnetic Wire

机译:铁磁丝中的自旋动力和库仑相互作用

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摘要

In metallic ferromagnets, external voltages induce charge and spin-polarized currents. Additionally, there can be magnetization dynamics, where the magnetic moments precess in time in response to external magnetic fields. The exchange interaction strongly couples the spin-polarized currents with the magnetization dynamics. In this way, external voltages can induce magnetization dynamics or, vice versa, external magnetic fields can induce currents.In ferromagnets, the long-range dipole interaction leads to the formation of magnetic domains, regions of aligned magnetic moments. In between the magnetic domains, there are domain walls, where the magnetization gradually varies. Such domain walls move in response to external magnetic fields. Previous studies have shown that a moving domain wall in ferromagnets generates a spin-motive force on the conduction electrons. In turn, the spin-motive force generates currents. Experimentally, the spin-motive induced currents have been detected.So far, research in this field has neglected the ubiquitous Coulomb interaction between the electrons. The central question we address is how Coulomb interaction between electrons affects the transport of the electrons subject to the spin-motive forces.To study this question, we first reproduce the known results of spin-motive forces when the magnetic domain wall is of the Neel type. The moving domain wall generates a spin-polarized electric current. We discuss its Berry s phase origin. Beyond previous studies, we find that the Coulomb interaction between the electrons leads to the screening of the spin-motive induced accumulated charges. The screening takes within the Thomas-Fermi screening length, which is very short in high-density metals. While screening strongly modifies the accumulated charges in the ferromagnets, the domain wall motion induced currents remains unaffected due to current conservation.
机译:在金属铁磁体中,外部电压会感应出电荷和自旋极化电流。另外,可能存在磁化动力学,其中磁矩会根据外部磁场及时进动。交换相互作用将自旋极化电流与磁化动力学强烈耦合。这样,外部电压会感应出磁化动力学,反之亦然,外部磁场会感应出电流。在铁磁体中,长距离偶极子相互作用会导致形成磁畴,即磁矩对齐的区域。在磁畴之间,有畴壁,磁化强度逐渐变化。这种畴壁响应于外部磁场而移动。先前的研究表明,铁磁体中的运动畴壁在传导电子上产生自旋动力。反过来,自旋动力产生电流。在实验上,已经检测到自旋动机感应电流。到目前为止,在该领域的研究已经忽略了电子之间普遍存在的库仑相互作用。我们要解决的中心问题是电子之间的库仑相互作用如何影响受自旋动力作用的电子的传输。为研究此问题,我们首先重现当磁畴壁为Neel时自旋动力的已知结果。类型。运动畴壁产生自旋极化电流。我们讨论它的贝里相位起源。除了以前的研究,我们发现电子之间的库仑相互作用导致对自旋动机感应的累积电荷的筛选。筛选时间在Thomas-Fermi筛选长度之内,这在高密度金属中非常短。尽管屏蔽强烈地修改了铁磁体中累积的电荷,但由于电流守恒,畴壁运动感应电流保持不受影响。

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    Gulbrandsen Sverre Aamodt;

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  • 年度 2015
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  • 原文格式 PDF
  • 正文语种 eng
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