Metastable magnetic domain wall dynamics

Mahdi Jamali, Kyoung Jin Lee, Hyunsoo Yang

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11 Citations (Scopus)

Abstract

The dynamics of metastable magnetic domain walls in straight ferromagnetic nanowires under spin waves, external magnetic fields and currentinduced spin-transfer torque are studied by means of micromagnetic simulations. It is found that in contrast to a stable wall, it is possible to displace a metastable domain wall in the absence of external excitation. In addition, independent of the domain wall excitation method, the velocity of a metastable wall is much smaller than that of a stable wall and its displacement direction could be different from that of the stable wall depending on the structure of metastable walls. Under current-induced spin-transfer torque excitation, the direction of domain wall displacement is directly related to the intensity of non-adiabatic spin-transfer torque. In a rough nanowire, it is found that the displacement of a metastable wall could happen much below the critical excitation of a stable wall. Furthermore, we show that it is possible to have either a forward or a backward displacement of a metastable domain wall by changing the pulse width of the excitation.

Original languageEnglish
Article number033010
JournalNew Journal of Physics
Volume14
DOIs
Publication statusPublished - 2012 Mar 1

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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