Journal Article

FZJ-2015-03895

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The antiferromagnetic structures of IrMn$_{3}$ and their influence on exchange-bias

Kohn, A. (Corresponding Author) ; Kovács, A.FZJ* ; Fan, R. ; McIntyre, G. J. ; Ward, R. C. C. ; Goff, J. P.

2013
Nature Publishing Group London

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Please use a persistent id in citations: http://hdl.handle.net/2128/8850  doi:10.1038/srep02412

Abstract: We have determined the magnetic structures of single-crystal thin-films of IrMn3 for the crystallographic phases of chemically-ordered L12, and for chemically-disordered face-centred-cubic, which is the phase typically chosen for information-storage devices. For the chemically-ordered L12 thin-film, we find the same triangular magnetic structure as reported for the bulk material. We determine the magnetic structure of the chemically-disordered face-centred-cubic alloy for the first time, which differs from theoretical predictions, with magnetic moments tilted away from the crystal diagonals towards the face-planes. We study the influence of these two antiferromagnetic structures on the exchange-bias properties of an epitaxial body-centred-cubic Fe layer showing that magnetization reversal mechanism and bias-field in the ferromagnetic layer is altered significantly. We report a change of reversal mechanism from in-plane nucleation of 90° domain-walls when coupled to the newly reported cubic structure towards a rotational process, including an out-of-plane magnetization component when coupled to the L12 triangular structure.

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Contributing Institute(s):

1. Mikrostrukturforschung (PGI-5)

Research Program(s):

1. 42G - Peter Grünberg-Centre (PG-C) (POF2-42G41) (POF2-42G41)

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