Magnetisation processes in exchange-biased systems

K. O'Grady*, N. W. Owen, T. Hughes, H. Laidler, A. K. Petford-Long

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

The nature of the exchange biasing process in thin-film materials in which an antiferromagnetic material is grown on top of a ferromagnetic layer is extremely complex due to thermally activated reversal in the antiferromagnet. Measurements of the hysteresis loops for Ta/NiFeCo/Cu/NiFeCo/FeMn/Ta spin-valve structures were undertaken and by careful control of temperature and time during the measurements we were able to characterize the reversal in the antiferromagnet via its effect on the ferromagnetic layer. In this way, we were able to show that the exchange field of the ferromagnet progressively reorders the antiferromagnetic layer with the process being driven by thermal activation. This can lead to an almost complete reversal in the direction of the exchange biasing.

Original languageEnglish (US)
Pages (from-to)1798-1799
Number of pages2
JournalJournal of Magnetism and Magnetic Materials
Volume226-230
Issue numberPART II
DOIs
StatePublished - Jan 1 2001

Keywords

  • Magnetisation reversal
  • Spin-valve
  • Thermal activation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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