Observation of asymmetry in domain wall velocity under transverse magnetic field

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The dynamics of a magnetic domain wall (DW) under a transverse magnetic field H-y are investigated in two-dimensional (2D) Co/Ni microstrips, where an interfacial Dzyaloshinskii-Moriya interaction (DMI) exists with DMI vector D lying in +y direction. The DW velocity exhibits asymmetric behavior for +/- H-y; that is, the DW velocity becomes faster when H-y is applied antiparallel to D. The key experimental results are reproduced in a 2D micromagnetic simulation, which reveals that the interfacial DMI suppresses the periodic change of the average DW angle phi even above the Walker breakdown and that H-y changes phi, resulting in a velocity asymmetry. This suggests that the 2D DW motion, despite its microscopic complexity, simply depends on the average angle of the DW and thus can be described using a one-dimensional soliton model. These findings provide insight into the magnetic DW dynamics in 2D systems, which are important for emerging spin-orbitronic applications.
Publisher
AMER INST PHYSICS
Issue Date
2016-03
Language
English
Article Type
Article
Citation

APL MATERIALS, v.4, no.3, pp.032504

ISSN
2166-532X
DOI
10.1063/1.4944897
URI
http://hdl.handle.net/10203/214142
Appears in Collection
PH-Journal Papers(저널논문)
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