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Magnetic Characterisation of Granular Alloy Thin Films (Invited)

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JournalJournal of the Magnetics Society of Japan
DatePublished - 1994
Volume18
Pages (from-to)379-384
Original languageEnglish

Abstract

In this paper the appropriate procedures for the magnetic characterisation of granular magnetic materials are reviewed. Particular emphasis is placed on the determination of the energy barrier distribution in the materials which is the most fundamental quantity available, given that the particle size and anisotropy are both distributed quantities. Techniques for the determination of interactions in granular systems are reviewed together with various models of interaction effects with emphasis on a recent Monte-Carlo model which has been particularly successful in predicting resistive phenomena. Finally the dynamic aspects of magnetisation reversal are discussed in terms of the time dependence of magnetisation that results. The implications of time dependence in granular GMR materials are examined. New data showing that resistive effects are themselves time dependent is also presented.

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