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Measurement of the energy barrier distribution in the antiferromagnetic layer of exchange-biased materials

O'Grady, K., Holloway, L. and Antel, W.J. (2002) Measurement of the energy barrier distribution in the antiferromagnetic layer of exchange-biased materials. IEEE Transactions on Magnetics. pp. 2741-2743. ISSN 1941-0069

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Abstract

The value of exchange field of two FeMn–NiFeCobased spin valves with varying thickness of the pinned ferromagnetic layer has been determined as a function of temperature. The complexities caused by thermal activation of the antiferromagnet during measurement have been overcome by the development of a measurement protocol. The values of the exchange field obtained provide a measure of the degree of order in the antiferromagnet. Thus it is possible to determine the distribution of energy barriers to reversal for the system. We find that for a 110-A -thick pinned NiFeCo layer a broad distribution exists, whereas for an 80-A layer, the distribution is bimodal and has a component subject to thermal activation at temperatures down to 260 K.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2002 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: Sherpa Assistant
Date Deposited: 16 Sep 2005
Last Modified: 16 Oct 2014 23:06
Published Version: http://dx.doi.org/10.1109/TMAG.2002.802867
Status: Published
Refereed: Yes
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/643

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