Thermally activated reversal in exchange-coupled structures

Y. G. Wang*, A. K. Petford-Long, H. Laidler, K. O'Grady, M. T. Kief

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


In this paper, we study the thermally activated reversal of IrMn/CoFe exchange-coupled structures using Lorentz microscopy and magnetometry. An asymmetry and a training effect were found on the hysteresis loops both with and without holding the film at negative saturation of the ferromagnetic layer. Holding the film at negative saturation results in the hysteresis loop shifting toward zero field. We believe that, in this system, two energy barrier distributions with different time constants coexist. The large-time-constant thermally activated reversal of the antiferromagnetic layer contributes to a increasing shift of the entire hysteresis loop toward zero field with increased period of time spent at negative saturation of the ferromagnetic layer. The small-time-constant thermal activation contributes to asymmetry in the magnetization reversal and training effects.

Original languageEnglish (US)
Pages (from-to)2773-2775
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 I
StatePublished - Sep 2002
Event2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
Duration: Apr 28 2002May 2 2002


  • Exchange-coupling
  • IrMn/CoFe
  • Magnetization reversal
  • Thermal activation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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