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arXiv 1202.1176cond-mat.str-elcond-mat.mes-hall
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手征磁体中Skyrmions的涌现电动力学

Emergent electrodynamics of skyrmions in a chiral magnet

T. Schulz, R. Ritz, A. Bauer, M. Halder, M. Wagner, C. Franz, C. Pfleiderer, K. Everschor, M. Garst, A. Rosch

摘要:

当一个电子在一个平滑变化的非共线磁结构中运动时,它的自旋取向不断地适应,从而感应出作用在磁结构和电子上的力,这些力可以用涌现电动力学的电场和磁场来描述。所谓的skyrmions的拓扑量化缠绕数,即,最近在手征磁体中发现的某些磁旋在理论上被预测为每个Skyrmion恰好感应出一个量子的出射磁通量。因此,一个运动的skyrmion预计将感应出一个符合法拉第感应定律的新兴电场,法拉第感应定律继承了这种拓扑量子化。在这里,我们报告的霍尔效应测量,建立定量预测的紧急电动力学。这使得我们能够获得在只有10^6 A/m^2的超低电流密度下Skyrmion与杂质脱钉的定量证据,以及它们随后的运动。非常小的电流密度和简单的传输测量相结合,提供了基本的见解之间的联系,涌现和真正的电动力学的skyrmions在手性磁体,并承诺是重要的应用程序在长期的。

英文摘要:

When an electron moves in a smoothly varying non-collinear magnetic structure, its spin-orientation adapts constantly, thereby inducing forces that act on both the magnetic structure and the electron. These forces may be described by electric and magnetic fields of an emergent electrodynamics. The topologically quantized winding number of so-called skyrmions, i.e., certain magnetic whirls, discovered recently in chiral magnets are theoretically predicted to induce exactly one quantum of emergent magnetic flux per skyrmion. A moving skyrmion is therefore expected to induce an emergent electric field following Faraday's law of induction, which inherits this topological quantization. Here we report Hall effect measurements, which establish quantitatively the predicted emergent electrodynamics. This allows to obtain quantitative evidence of the depinning of skyrmions from impurities at ultra-low current densities of only 10^6 A/m^2 and their subsequent motion. The combination of exceptionally small current densities and simple transport measurements offers fundamental insights into the connection between emergent and real electrodynamics of skyrmions in chiral magnets, and promises to be important for applications in the long-term.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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