Observation of asymmetry in domain wall velocity under transverse magnetic field

K. J. Kim, Y. Yoshimura, T. Okuno, T. Moriyama, S. W. Lee, Kyoung Jin Lee, Y. Nakatani, T. Ono

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The dynamics of a magnetic domain wall (DW) under a transverse magnetic field Hy 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 ±Hy; that is, the DW velocity becomes faster when Hy 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 φ even above the Walker breakdown and that Hy changes φ, 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.

Original languageEnglish
Article number032504
JournalAPL Materials
Volume4
Issue number3
DOIs
Publication statusPublished - 2016 Mar 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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