The European Physical Journal B

, Volume 60, Issue 1, pp 15–27 | Cite as

Transient domain wall displacement under spin-polarized current pulses

  • A. Thiaville
  • Y. Nakatani
  • F. Piéchon
  • J. Miltat
  • T. Ono
Mesoscopic and Nanoscale Systems

Abstract.

This paper investigates the non steady-state displacement of magnetic domain walls in a nanostrip submitted to a time-dependent spin-polarized current flowing along the nanostrip. First, numerical micromagnetic simulations show that a domain wall can move under application of a current pulse, and that the displacement resulting from a conversion of the domain wall structure is quantized. The numerical findings are subsequently explained in the framework of simplified analytic models, namely the 1D model and the point-core vortex model. We then introduce the concept of an angle linked to the magnetization of a general domain wall, and show that it allows understanding the transient phenomena quite generally. Simple analytic formulas are derived and compared to experiments. For this, charts are given for the key parameters of the domain wall mechanics, as obtained from numerical micromagnetic simulations. We finally discuss the limitations of this work, by looking at the influence of temperature elevation under current, presence of a non-adiabatic term, and of disorder.

PACS.

72.25.-b Spin polarized transport 85.75.-d Magnetoelectronics; spintronics 75.75.+a Magnetic properties of nanostructures 75.60.Ch Domain walls and domain structure 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  • A. Thiaville
    • 1
  • Y. Nakatani
    • 2
  • F. Piéchon
    • 1
  • J. Miltat
    • 1
  • T. Ono
    • 3
  1. 1.CNRS, Laboratoire de Physique des Solides, UMR 8502OrsayFrance
  2. 2.Department of Computer ScienceTokyoJapan
  3. 3.Institute for Chemical ResearchKyotoJapan

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