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Magnetization reversal in mesoscopic Ni80Fe20 wires: A magnetic domain launching device

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Author(s)

  • W.Y. Lee
  • A. Hirohata
  • H.T. Leung
  • C.M. Guertler
  • Y.B. Xu
  • S.M. Gardiner
  • C.C. Yao
  • J.A.C. Bland

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Publication details

JournalIEEE Transactions on Magnetics
DatePublished - Sep 2000
Issue number5 (Part 1)
Volume36
Number of pages2
Pages (from-to)3018-3020
Original languageEnglish

Abstract

The magnetization reversal process in mesoscopic permalloy (Ni80Fe20) wire structures has been investigated using scanning Kerr microscopy, magnetic force microscopy (MFM) and micromagnetic calculations. We find that the junction offers a site for reversed domain wall nucleation in the narrow part of the wires. As a consequence, the switching field is dominated by the domain nucleation field and the junction region initiates reversal by the wall motion following the nucleation of domains. Our results suggest the possibility of designing structures that can be used to “launch” reverse domains in narrow wires within a controlled field range

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    Research areas

  • magnetization reversal, mesoscopic wires, nucleation process, switching field

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