Controlling the exchange interaction using the spin-flip transition of antiferromagnetic spins in Ni 81 Fe 19 α- Fe 2 O 3

Joonghoe Dho, Chi Wah Leung, Z. H. Barber, M. G. Blamire

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5 Citations (Scopus)

Abstract

We have studied exchange bias and coercivity in ferromagnetic (FM) Ni81 Fe19 layers coupled with antiferromagnetic (AF) (0001), (11 2- 0), and (1 1- 02) α- Fe2 O3 layers. We show that the exchange interaction between FM and AF layers is controllable by a magnetic-field annealing (MFA) through a spin reorientation temperature of an AF material, similar to a MFA through a Ǹel temperature in normal exchange-biased systems. For (11 2- 0) and (1 1- 02) α- Fe2 O3, the temperature-dependent exchange bias displayed a sudden increase below a spin-flip temperature of α- Fe2 O3 (Tm) and the coercivity showed a clear variation near Tm.
Original languageEnglish
Article number10K101
JournalJournal of Applied Physics
Volume97
Issue number10
DOIs
Publication statusPublished - 15 May 2005
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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