Current-Driven Dynamics of Magnetic Hopfions

被引：98

作者：

Wang, X. S. ^{[1
]}

Qaiumzadeh, A. ^{[1
]}

Brataas, A. ^{[1
]}

机构：

[1] Norwegian Univ Sci & Technol, Ctr Quantum Spintron, Dept Phys, NO-7491 Trondheim, Norway

来源：

PHYSICAL REVIEW LETTERS | 2019年 / 123卷 / 14期

基金：

欧洲研究理事会; 中国博士后科学基金;

关键词：

SKYRMIONS; SOLITONS; MOTION;

D O I：

10.1103/PhysRevLett.123.147203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 nontrivial Hopf index. We find that, in ferromagnetic materials, two types of hopfions, Bloch-type and Neel-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. Neel-type hopfions move along the current direction via both STT and SHT, while Bloch-type hopfions move either transverse to the current direction via SHT or parallel to the current direction via STT. Our findings open the door to utilizing hopfions as information carriers.

引用

页数：6

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