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Time dependence studies on giant magnetoresistive Co/Cu multilayers

Holliday, N.T., Hill, E.W., Marrows, C.H., Stanley, F.E. and Hickey, B.J. (2000) Time dependence studies on giant magnetoresistive Co/Cu multilayers. IEEE Transactions on Magnetics, 36 (5 (par). pp. 2847-2849. ISSN 0018-9464

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Time dependence studies consisting of applying current steps at fixed applied fields have been carried out on bilinear and biquadratic giant magnetoresistive (GMR) Co/Cu multilayers in a temperature controlled environment. It has been shown that the voltage responses to current steps of these aged multilayers are greater in magnitude before field cycling compared to those made after field cycling. Normalized voltage measurements for some samples suggest a magnetic viscosity effect due to a current step at zero-field is present and before field cycling. The effect is reduced after field cycling. This behavior suggests that the effect being seen is purely magnetic in origin, as only the field is being varied. A ln( ) type function has been curve fitted to the zero field voltage response to a current step before field cycling. Voltage measurements made on the Co/Cu films at different field values show that as the applied fields are increased the voltage response has a reduced ln(t) character.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2000 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.
Keywords: Co/Cu multilayers, giant magnetoresistance, magnetic viscosity, time dependence
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: 10 Jun 2014 10:43
Published Version: http://dx.doi.org/10.1109/20.908605
Status: Published
Refereed: Yes
Identification Number: 10.1109/20.908605
URI: http://eprints.whiterose.ac.uk/id/eprint/729

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