Domain-wall dynamics in translationally nonivariant nanowires: Theory and applications

O. A. Tretiakov, Y. Liu, Ar Abanov

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We generalize domain-wall dynamics to the case of translationally noninvariant ferromagnetic nanowires. The obtained equations of motion make the description of the domain-wall propagation more realistic by accounting for the variations along the wire, such as disorder or change in the wire shape. We show that the effective equations of motion are very general and do not depend on the model details. As an example of their use, we consider an hourglass-shaped nanostrip in detail. A transverse domain wall is trapped in the middle and has two stable magnetization directions. We study the switching between the two directions by short current pulses. We obtain the exact time dependence of the current pulses required to switch the magnetization with the minimal Ohmic losses per switching. Furthermore, we find how the Ohmic losses per switching depend on the switching time for the optimal current pulse. As a result, we show that as a magnetic memory device this nanodevice may be 105 times more energy efficient than the best modern devices.

Original languageEnglish
Article number247201
JournalPhysical review letters
Volume108
Issue number24
DOIs
Publication statusPublished - 2012 Jun 11

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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