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Determination of activation volumes of reversal in perpendicular media

Dutson, J D, O'Grady, K, Lu, B, Kubota, Y and Platt, C L (2003) Determination of activation volumes of reversal in perpendicular media. IEEE Transactions on Magnetics. pp. 2344-2346. ISSN 1941-0069

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Abstract

We discuss a method for the determination of activation volumes of reversal in perpendicular media. This method does not require correction for the self-demagnetizing field normally associated with these media. This is achieved by performing time dependence measurements at a constant level of magnetization. From the difference in time taken for the magnetization to decay to a fixed value at two fields-separated by a small increment DeltaH, the activation volume can be determined. We report data for both CoCrPt alloy films and a multilayer film, typical of those materials under consideration for use as perpendicular media. We find activation volumes that are consistent with the hysteresis curves of the materials. The activation volume scales qualitatively with the exchange coupling. The alloy films have significantly lower activation volumes, implying that they would be capable of supporting a higher data density.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2003 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: activation volume, fluctuation field, magnetic characterization, perpendicular recording media, THIN-FILM MEDIA, RECORDING MEDIA, TIME, SYSTEMS
Institution: The University of York
Academic Units: The University of York > Physics (York)
Depositing User: Sherpa Assistant
Date Deposited: 16 Sep 2005
Last Modified: 17 Oct 2014 04:28
Published Version: http://dx.doi.org/10.1109/TMAG.2003.816292
Status: Published
Refereed: Yes
Related URLs:
URI: http://eprints.whiterose.ac.uk/id/eprint/649

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