Spin-orbit torque induced dipole skyrmion motion at room temperature

作     者：Sergio A. Montoya Robert Tolley Ian Gilbert Soong-Geun Je Mi-Young Im Eric E. Fullerton 

作者机构：Space and Naval Warfare Systems Center Pacific San Diego California 92152 USA Center for Memory and Recording Research University of California La Jolla California 92093 USA Department of Electrical and Computer Engineering University of California La Jolla California 92093 USA Center for Nanoscale Science and Technology National Institute of Standards and Technology Gaithersburg Maryland 20899 USA Center for X-Ray Optics Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Emerging Materials Science Daegu Gyeongbuk Institute of Science and Technology Daegu Korea 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2018年第98卷第10期

页      面：104432-104432页

核心收录：

基　　金：Future Planning, (18-BT-02) Naval Innovation Science and Engineering Program U.S. Department of Energy, USDOE Basic Energy Sciences, BES, (DE-AC02-05CH11231, DE-SC0003678, R13.0004.04) Ministry of Communication and Information Technology, MCIT University of California, San Diego, UCSD National Research Council, NRC National Research Foundation of Korea, NRF Junta Nacional de Investigação Científica e Tecnológica, JNICT Ministry of Education, Science and Technology, MEST, (2012K1A4A3053565) Daegu Gyeongbuk Institute of Science and Technology, DGIST 

主　　题：Skyrmions Spin torque 

摘      要：We demonstrate deterministic control of dipole-field-stabilized skyrmions by means of spin-orbit torques arising from heavy transition-metal seed layers. Experiments are performed on amorphous Fe/Gd multilayers that are patterned into wires and exhibit stripe domains and dipole skyrmions at room temperature. We show that while the domain walls and skyrmions are achiral on average due to lack of Dzyaloshinskii-Moriya interactions, the Néel-like closure domain walls at each surface are chiral and can couple to spin-orbit torques. The current-induced domain evolutions are reported for different magnetic phases, including disordered stripe domains, coexisting stripes and dipole skyrmions, and a close-packed dipole skyrmion lattice. The magnetic textures exhibit motion under current excitations with a current density ∼108A/m2. By comparing the motion resulting from magnetic spin textures in Fe/Gd films with different heavy transition-metal interfaces, we confirm spin currents can be used to manipulate achiral dipole skyrmions via spin-orbit torques. We further show the current-induced response of a dipole skyrmion lattice where skyrmions move in channels between pinned regions.