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arXiv 2003.07303cond-mat.mes-hallcond-mat.str-el
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磁hopfions的拓扑Hall特征

Topological Hall signatures of magnetic hopfions

Börge Göbel, Collins Ashu Akosa, Gen Tatara, Ingrid Mertig

摘要:

磁霍普夫子是一种拓扑保护的三维磁孤子,它由一个在截面轮廓上具有拓扑非平凡自旋织构且接近环面的管子构成。在这里,我们表明,hopfion的局部未补偿的紧急领域导致拓扑霍尔签名,虽然拓扑霍尔效应在全球范围内消失。拓扑霍尔特征可通过磁场或电流切换,并且独立于异常和常规霍尔效应发生。因此,它可以被用来在实验中电学检测hopfions,甚至可以将它们与其他纹理(如skyrmion tubes)区分开来。此外,它可以潜在地用于自旋电子器件。举例来说,我们提出了一个基于hopfion的赛道数据存储设备和模拟的信息载体的hopfion的电检测。

英文摘要:

Magnetic hopfions are topologically protected three-dimensional solitons that are constituted by a tube which exhibits a topologically nontrivial spin texture in the cross-section profile and is closed to a torus. Here we show that the hopfion's locally uncompensated emergent field leads to a topological Hall signature, although the topological Hall effect vanishes on the global level. The topological Hall signature is switchable by magnetic fields or electric currents and occurs independently of the anomalous and conventional Hall effects. It can therefore be exploited to electrically detect hopfions in experiments and even to distinguish them from other textures like skyrmion tubes. Furthermore, it can potentially be utilized in spintronic devices. Exemplarily, we propose a hopfion-based racetrack data storage device and simulate the electrical detection of the hopfions as carriers of information.

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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