论文标题
在手性磁铁的纳米管中预测限制和可控的BLOCH点
Prediction of confined and controllable Bloch points in nanocubes of chiral magnets
论文作者
论文摘要
这项工作预测，可以通过纳米型中的磁和手性相互作用来创建和稳定单个BLOCH点，并局限于两种相反极性的手性弹回者之间。 Bloch点可以通过中等强度的外部磁场移动，但前提是场强足以克服固定交换力和外部表面效应产生的固定电位。 Bloch点可以由外部场驱动，朝着与场地相对的方向驱动，并且它保持稳定至中等的场优势。在临界场的强度下，Bloch点通过其中一个表面逃脱，留下了共线磁化配置，并且在删除磁场后形成了新的Bloch点。这些发现突出了纳米结构中的拓扑多样性，并表明，尽管其零维度为零，但通过其周围的大量磁性体积耦合到外部磁场。拓扑点缺陷的控制在可逆的可移动纳米磁纹理及其相关的新兴电动力学方面具有技术意义。
This work predicts that individual Bloch points can be created and stabilized by magnetostatic and chiral interactions in nanocuboids, confined in between two chiral bobbers of opposing polarity. The Bloch point can be moved by an external magnetic field of moderate strength but only if the field strength is enough to overcome a pinning potential that results from intrinsic exchange forces and extrinsic surface effects. The Bloch point can be driven by the external field reversibly, in a direction opposing the field, and it remains stable up to moderate field strengths. At a critical field strength the Bloch point escapes through one of the surfaces, leaving behind a collinear magnetization configuration, and upon removing the field a new Bloch point is formed. These findings highlight the topological diversity in nanostructures and show that a Bloch point, despite its zero-dimensionality, couples to external fields via a substantial magnetic volume around it. The control of topological point defects has technological implications with regards to reversibly movable nanomagnetic textures and their associated emergent electrodynamics.
