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Engineering the magnetic properties of epitaxial RE-Fe2 Laves phase alloy and multilayer films

Engineering the magnetic properties of epitaxial RE-Fe2 Laves phase alloy and multilayer films
Engineering the magnetic properties of epitaxial RE-Fe2 Laves phase alloy and multilayer films

Epitaxial Laves phase based alloy and multilayer films grown by molecular beam Epitaxy enable the study of the influence of epitaxial strain upon the magnetic properties of the materials.   In particular, the temperature dependence of anisotropy constant of highly magnetostrictive materials such as DyFeand TbFe2 synthesized on a substrate is the signature of the built-in epitaxial strain effect.

The magnetisation reversal mechanism in DyFe2 – YFe2 multilayer and DyFe2 / TbFe2 alloy films can be described by the principle of coherent rotation.  However, in the case of DyFe2 – YFe2 multilayer films, if the YFe2 layer is sufficiently thick, the interfacial interaction give rise to the formation of magnetic exchange springs in the YFe2 layer.

The DyFe2 – YFe2 superlattices form convenient model systems to study the effect of magnetic exchange springs, since the relative thickness of the DyFe2 and YFe2 layers are readily controlled in the growth process.  Moreover, the magnetic  exchange springs can be tailored to engineer novel magnetic phases such as negative coercivity, and magnetic compensation points.

University of Southampton
Beaujour, Jean-Marc L
Beaujour, Jean-Marc L

Beaujour, Jean-Marc L (2003) Engineering the magnetic properties of epitaxial RE-Fe2 Laves phase alloy and multilayer films. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

Epitaxial Laves phase based alloy and multilayer films grown by molecular beam Epitaxy enable the study of the influence of epitaxial strain upon the magnetic properties of the materials.   In particular, the temperature dependence of anisotropy constant of highly magnetostrictive materials such as DyFeand TbFe2 synthesized on a substrate is the signature of the built-in epitaxial strain effect.

The magnetisation reversal mechanism in DyFe2 – YFe2 multilayer and DyFe2 / TbFe2 alloy films can be described by the principle of coherent rotation.  However, in the case of DyFe2 – YFe2 multilayer films, if the YFe2 layer is sufficiently thick, the interfacial interaction give rise to the formation of magnetic exchange springs in the YFe2 layer.

The DyFe2 – YFe2 superlattices form convenient model systems to study the effect of magnetic exchange springs, since the relative thickness of the DyFe2 and YFe2 layers are readily controlled in the growth process.  Moreover, the magnetic  exchange springs can be tailored to engineer novel magnetic phases such as negative coercivity, and magnetic compensation points.

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Published date: 2003

Identifiers

Local EPrints ID: 465793
URI: http://eprints.soton.ac.uk/id/eprint/465793
PURE UUID: 27057052-eec0-4dbc-b7b5-633bff83e82e

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Date deposited: 05 Jul 2022 03:07
Last modified: 05 Jul 2022 06:24

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Author: Jean-Marc L Beaujour

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