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Thermally activated reversal in exchange-coupled structures

Wang, Y.G., Petford-Long, A.K., Laidler, H., O'Grady, K. and Kief, M.T. (2002) Thermally activated reversal in exchange-coupled structures. IEEE Transactions on Magnetics. pp. 2773-2775. ISSN 1941-0069

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Abstract

In this paper, we study the thermally activated reversal of IrMn/CoFe exchange-coupled structures using Lorentz microscopy and magnetometry. An asymmetry and a training effect were found on the hysteresis loops both with and without holding the film at negative saturation of the ferromagnetic layer. Holding the film at negative saturation results in the hysteresis loop shifting toward zero field. We believe that, in this system, two energy barrier distributions with different time constants coexist. The large-time-constant thermally activated reversal of the antiferromagnetic layer contributes to a increasing shift of the entire hysteresis loop toward zero field with increased period of time spent at negative saturation of the ferromagnetic layer. The small-time-constant thermal activation contributes to asymmetry in the magnetization reversal and training effects.

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 19:00
Published Version: http://dx.doi.org/10.1109/TMAG.2002.803158
Status: Published
Refereed: Yes
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/644

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