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Exchange bias and fourfold magnetic anisotropy in Permalloy thin film on epitaxial hematite antiferromagnet

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3 Author(s)
Bali, R. ; Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge CB2 3QZ, United Kingdom ; Stelmashenko, N.A. ; Blamire, M.G.

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Fourfold anisotropy was observed in NiFe films deposited on epitaxial antiferromagnet α-Fe2O3. The anisotropy was preserved despite off-axis magnetic field annealing (MFA) below the Néel temperature (TN). The cumulative effect of this fourfold anisotropy and exchange coupling due to MFA determined the exchange bias (Hex) distribution. Physically, this indicated the existence of two types of antiferromagnet domains—those that were frozen in below TN and contributed to the fourfold anisotropy and those that coupled with the annealing magnetic field and contributed to the conventional Hex distribution.

Published in:

Journal of Applied Physics  (Volume:103 ,  Issue: 5 )