Soliton-like magnetic domain wall motion induced by the interfacial Dzyaloshinskii-Moriya interaction
| Autor: | Yoko Yoshimura, Kab-Jin Kim, Takuya Taniguchi, Takayuki Tono, Kohei Ueda, Ryo Hiramatsu, Takahiro Moriyama, Keisuke Yamada, Yoshinobu Nakatani, Teruo Ono |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
Condensed Matter - Materials Science Magnetic domain Spintronics Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Magnetism Skyrmion Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Vortex Topological defect Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Wall motion Soliton 010306 general physics 0210 nano-technology Nonlinear Sciences::Pattern Formation and Solitons Computer Science::Databases |
| Popis: | Topological defects such as magnetic solitons, vortices, Bloch lines, and skyrmions have started to play an important role in modern magnetism because of their extraordinary stability, which can be exploited in the production of memory devices. Recently, a novel type of antisymmetric exchange interaction, namely the Dzyaloshinskii-Moriya interaction (DMI), has been uncovered and found to influence the formation of topological defects. Exploring how the DMI affects the dynamics of topological defects is therefore an important task. Here we investigate the dynamic domain wall (DW) under a strong DMI and find that the DMI induces an annihilation of topological vertical Bloch lines (VBLs) by lifting the four-fold degeneracy of the VBL. As a result, velocity reduction originating from the Walker breakdown is completely suppressed, leading to a soliton-like constant velocity of the DW. Furthermore, the strength of the DMI, which is the key factor for soliton-like DW motion, can be quantified without any side effects possibly arising from current-induced torques or extrinsic pinnings in magnetic films. Our results therefore shed light on the physics of dynamic topological defects, which paves the way for future work in topology-based memory applications. |
| Databáze: | OpenAIRE |
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