Year: 2021
Type: article
Abstract: We show a topological spin texture called “bimeronium” in magnets with in-plane magnetization. It is a topological counterpart of skyrmionium in perpendicularly magnetized magnets and can be seen as a combination of two bimerons with opposite topological charges. We report the static structure and spin-orbit-torque-induced dynamics of an isolated bimeronium in a magnetic monolayer with frustrated exchange interactions. We study the anisotropy and magnetic field dependences of a static bimeronium. We also explore the bimeronium dynamics driven by the damping-like spin-orbit torque. We find that the bimeronium shows steady rotation when the spin polarization direction is parallel to the easy axis. Moreover, we demonstrate the annihilation of the bimeronium when the spin polarization direction is perpendicular to the easy axis. Our results are useful for understanding the fundamental properties of bimeronium structures and may offer an approach to build bimeronium-based spintronic devices.
Source: Applied Physics Letters
DOI: 10.1063/5.0034396
Authors: Xichao Zhang, Jing Xia, Motohiko Ezawa, Oleg A. Tretiakov, Hung T. Diep, Guoping Zhao, Xiaoxi Liu, Yan Zhou
Institutions: Chinese University of Hong Kong, Chinese University of Hong Kong, Shenzhen, Sichuan Normal University, The University of Tokyo, National University of Science and Technology, UNSW Sydney, Laboratoire de Physique Théorique et Modélisation, Université de Cergy-Pontoise, Shinshu University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: 白云鄂博共伴生原矿混合稀土永磁材料的制备及机理研究, G2167912879, G2416847431, G256627661, G3457601975, G3525190316, Magnonics with skyrmions, Memory, Logic Computing, and Neural Networks Based on Topological Spin Textures, G5529915139, 新型蜂窝状复合铁氧体的磁性能、交换耦合及微磁结构研究, G6492276158, G7461467917, Theory of nonlinear and nonreciprocal responses in noncentrosymmetric electronic systems, Theoretical study on novel quantum phases based on topology and crystal groups, G8896398491
OpenAlex ID: W3094050321