Physics and Astronomy, Department of
Department of Physics and Astronomy: Faculty Publications
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Document Type
Article
Date of this Version
7-1-2004
Abstract
Intergranular interactions in nanostructured FePt:Ag thin films and their effect on magnetic hysteresis are investigated. The films, produced by multilayer deposition plus rapid thermal annealing, consist of FePt nanoparticles embedded in a silver matrix. They are investigated by magnetization measurements and magnetic force microscopy. Analytical model calculations, supported by micromagnetic simulations, are used to elucidate the relation between coercivity, hysteresis-loop slope, and spatial correlations during magnetization reversal. The analytical calculations yield simple expressions for the loop slope and the coercivity as a function of the intergranular exchange. Small intergranular exchange enhances the coercivity, but for strong exchange there is a self-energy cutoff, associated with the onset of cooperative reversal and preventing alpha from becoming negative.
Comments
Published in IEEE TRANSACTIONS ON MAGNETICS, VOL. 40, NO. 4, JULY 2004. Copyright 2004 IEEE. Used by permission.
Digital Object Identifier 10.1109/TMAG.2004.832168