Journal of Magnetism and Magnetic Materials
Volumes 198-199,
1 June 1999,
Pages 468-470
PII: S0304-8853(98)01155-X
Copyright © 1999 Elsevier Science B.V. All rights reserved.
Coercivity induced by random field at ferromagnetic and antiferromagnetic interfaces
S. Zhang
, 
, a, D. V. Dimitrovb, G. C. Hadjipanayisb, J. W. Caic and C. L. Chienc
a Physics Department, New York University, 4 Washington Place, New York, NY 10003, USA
b Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
c Department of Physics, Johns Hopkins University, Baltimore, MD 21218, USA
Available online 7 January 2000.
Abstract
In the presence of random fields at an interface between a ferromagnetic and an antiferromagnetic layer, the domain walls in the ferromagnetic layer are pinned by local minimum energy. To move the domain walls, an applied magnetic field must be large enough to overcome statistically fluctuating energy. We have calculated this energy and found that the coercivity can be as large as a few kOe for a thin ferromagnetic layer. It is also found that the coercive field at low temperature scales as 1/t3/2 where t is the F layer thickness, and the coercive field decreases strongly with temperature.
Author Keywords: Coercivity; Exchange bias
Article Outline
References
(4K)
Fig. 1. The values of coercivity as function of NiFe thickness t of exchange-coupled NiFe(t)/CoO at 80 K and Ni0.5Co0.5O/NiFe(t) at 10 K showing the Hc=A/tn dependence with n=1.51±0.05 and 1.427±0.05, respectively.
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Corresponding author. Tel.: +1-212-9987724; fax: +1-212-9954016; email: shufeng.zhng@nyu.edu
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