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Modeling the magnetic properties of DyFe2/YFe2 superlattices

Bowden, G.J., Beaujour, J-M.L., Zhukov, A.A., Rainford, B.D., de Groot, P.A.J., Ward, R.C.C. and Wells, M.R. (2003) Modeling the magnetic properties of DyFe2/YFe2 superlattices Journal of Applied Physics, 93, (10), pp. 6480-6482. (doi:10.1063/1.1539072).

Record type: Article

Abstract

The Stoner–Wohlfarth model has proved reasonably successful in describing the coercivities of antiferromagnetically coupled DyFe2/YFe2 hard/soft superlattices in the absence of magnetic exchange springs. In particular, the coercivity rises sharply as the net magnetic moment of the superlattice approaches zero. However the situation becomes more complicated as the thickness of the YFe2 layers is increased. Two distinct "instability fields" can be identified: the bending field BB, signifying the onset of a magnetic exchange spring, and the irreversible switching field BIS associated with magnetic reversal. We have developed a computational model to address this problem. In particular, it is shown that the two instability fields in question are characterized by vanishing eigenvalues in the matrix formed by the double energy derivatives [partial-derivative]2E/[partial-derivative]thetai[partial-derivative]thetaj, where E is the total energy and thetai the angle of each individual monolayer. It is shown that the model provides a very good description of the M–Bapp loops of DyFe2/YFe2 multilayer films. In particular, the coercivity of a nearly magnetically compensated multilayer (75 ÅDyFe2/150 ÅYFe2) is much reduced below the prediction of the Stoner–Wolhfarth model, in accord with experiment.

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Published date: 2003

Identifiers

Local EPrints ID: 57106
URI: http://eprints.soton.ac.uk/id/eprint/57106
ISSN: 0021-8979
PURE UUID: c02893f8-cb77-477e-bb4f-e6e6b1abc9c1

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Date deposited: 13 Aug 2008
Last modified: 25 Jul 2017 16:31

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Contributors

Author: G.J. Bowden
Author: J-M.L. Beaujour
Author: A.A. Zhukov
Author: B.D. Rainford
Author: P.A.J. de Groot
Author: R.C.C. Ward
Author: M.R. Wells

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