论文标题
磁跳的拓扑厅签名
Topological Hall signatures of magnetic hopfions
论文作者
论文摘要
磁性跳是拓扑保护的三维孤子，由管子在横截面剖面中表现出拓扑非平凡的自旋纹理，并与圆环封闭。在这里，我们表明，尽管拓扑厅效应在全球层面上消失了，但Hopfion的本地无偿的新兴现场导致了拓扑厅的签名。拓扑大厅的签名可通过磁场或电流切换，并且独立于异常和常规的大厅效应。因此，可以利用它来检测实验中的跳跃，甚至可以将它们与天空管等其他纹理区分开。此外，它可能可以在Spintronic设备中使用。示例性地，我们提出了一个基于跳跃的赛车数据存储设备，并模拟了跳跃作为信息载体的电气检测。
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.
