期刊
AIP ADVANCES
卷 7, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4974889
关键词
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资金
- FIRST program of JSPS
- R&D Project for ICT Key Technology to Realize Future Society of MEXT
- ImPACT Program of CSTI
- EPSRC [EP/K03278X/1]
- JSPS
- MEXT, Govt. of Japan
Creep motion of magnetic domain wall (DW), thermally activated DW dynamics under subthreshold driving forces, is a paradigm to understand the interaction between driven interfaces and applied external forces. Previous investigation has shown that DW in a metallic system interacts differently with current and magnetic field, manifesting itself as different universality classes for the creep motion. In this article, we first review the experimental determination of the universality classes for current-and field-driven DW creeps in a Ta/CoFeB/MgO wire, and then elucidate the underlying factors governing the obtained results. We show that the nature of torque arising from current in association with DW configuration determines universality class for the current-induced creep in this system. We also discuss the correlation between the field-induced DW creep characteristics and structure observed by a transmission electron microscope. The observed results are expected to provide a deeper understanding for physics of DW motion in various magnetic materials. (C) 2017 Author(s).
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