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Effects of impurity atoms on sputtered GMR multilayers

Marrows, C.H., Hickey, B.J., Malinowska, M. and Meny, C. (1997) Effects of impurity atoms on sputtered GMR multilayers. IEEE Transactions on Magnetics, 33 (5 (Par). pp. 3673-3675. ISSN 0018-9464

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Abstract

We have investigated the effects of residual gas impurity atoms on interlayer exchange coupling and giant magnetoresistance (GMR) in Co(9Ä)/Cu(9Ä) multilayers. Structural analysis was performed by Co(59) NMR. We deposited sub-monolayer quantities of residual gases at different points in the Co/Cu bilayer; the interfaces, or the middle of the Cu spacers or CO magnetic layers. Impurities at the interface lower the GMR and increase remenant fraction and saturation field. We are able to model these results phenomenologically by adding biquadratic coupling. Impurities in the bulk of the Cu layers lower GMR still further, and such samples are well described by models containing almost 100% biquadratic coupling. We have demonstrated that the ttansport parameters in our samples are largely unaffected by small quantities of impurities, but that the interlayer coupling is extremely sensitive to them, particularly in the bulk of the Cu spacer layers.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 1997 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 Leeds
Academic Units: The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds)
Depositing User: Sherpa Assistant
Date Deposited: 10 Oct 2005
Last Modified: 07 Jun 2014 18:06
Published Version: http://dx.doi.org/10.1109/20.619534
Status: Published
Refereed: Yes
Identification Number: 10.1109/20.619534
URI: http://eprints.whiterose.ac.uk/id/eprint/727

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