Domain wall dynamics driven by spin transfer torque and the spinorbit field

Masamitsu Hayashi, Yoshinobu Nakatani, Shunsuke Fukami, Michihiko Yamanouchi, Seiji Mitani, Hideo Ohno

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

We have studied current-driven dynamics of domain walls when an in-plane magnetic field is present in perpendicularly magnetized nanowires using an analytical model and micromagnetic simulations. We model an experimentally studied system, ultrathin magnetic nanowires with perpendicular anisotropy, where an effective in-plane magnetic field is developed when current is passed along the nanowire due to the Rashba-like spinorbit coupling. Using a one-dimensional model of a domain wall together with micromagnetic simulations, we show that the existence of such in-plane magnetic fields can either lower or raise the threshold current needed to cause domain wall motion. In the presence of the in-plane field, the threshold current differs for positive and negative currents for a given wall chirality, and the wall motion becomes sensitive to out-of-plane magnetic fields. We show that large non-adiabatic spin torque can counteract the effect of the in-plane field.

Original languageEnglish
Article number024221
JournalJournal of Physics Condensed Matter
Volume24
Issue number2
DOIs
Publication statusPublished - 2012 Jan 18

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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