arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1905.09154cond-mat.mes-hall
收藏

电流驱动下磁Hopfions的动力学

Current-Driven Dynamics of Magnetic Hopfions

X. S. Wang, A. Qaiumzadeh, A. Brataas

摘要:

拓扑磁织构由于具有新的性质和在信息技术中的应用前景而引起了人们的广泛兴趣。磁霍普夫子是具有非平凡霍普夫指数的磁化强度的三维(3D)空间变化。我们发现,在铁磁材料中,在体相和界面Dzyaloshinskiii-Moriya相互作用的存在下,两种类型的hopfion,Bloch型和Néel型hopfion,可以分别被激发为亚稳态.我们进一步研究了如何通过自旋转移矩(STTs)和自旋霍尔矩(SHTs)的电流可以驱动hopfions。与2D铁磁skyrmions不同,hopfions有一个消失的回转矢量。因此,不存在不期望的霍尔效应。Néel型hopfion通过STT和SHT沿电流方向移动,而Bloch型hopfion可以通过SHT横向于电流方向移动或通过STT平行于电流方向移动。我们的研究结果打开了大门,利用hopfions作为信息载体。

英文摘要:

Topological magnetic textures have attracted considerable interest since they exhibit new properties and might be useful in information technology. Magnetic hopfions are three-dimensional (3D) spatial variations in the magnetization with a non-trivial Hopf index. We find that in ferromagnetic materials, two types of hopfions, Bloch-type and Néel-type hopfions, can be excited as metastable states in the presence of bulk and interfacial Dzyaloshinskii-Moriya interactions, respectively. We further investigate how hopfions can be driven by currents via spin-transfer torques (STTs) and spin-Hall torques (SHTs). Distinct from 2D ferromagnetic skyrmions, hopfions have a vanishing gyrovector. Consequently, there are no undesirable Hall effects. Néel-type hopfions move along the current direction via both STT and SHT, while Bloch-type hopfions can be moved either transverse to the current direction by SHT or parallel to the current direction by STT. Our findings open the door to utilizing hopfions as information carriers.

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。

↑