The antiferromagnetic structures of IrMn3 and their influence on exchange-bias

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dc.contributor.authorKohn, Aen_AU
dc.contributor.authorKovács, Aen_AU
dc.contributor.authorFan, Ren_AU
dc.contributor.authorMcIntyre, GJen_AU
dc.contributor.authorWard, RCCen_AU
dc.contributor.authorGoff, JPen_AU
dc.date.accessioned2014-05-19T01:25:42Zen_AU
dc.date.available2014-05-19T01:25:42Zen_AU
dc.date.issued2013-08-12en_AU
dc.date.statistics2014-05-19en_AU
dc.description.abstractWe 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. © 2013, Nature Publishing Group.en_AU
dc.identifier.articlenumber2412en_AU
dc.identifier.citationKohn, A., Kovács, A., Fan, R., McIntyre, G. J., Ward, R. C. C., & Goff, J. P. (2013). The antiferromagnetic structures of IrMn3 and their influence on exchange-bias. Scientific Reports, 3, 2412. doi:10.1038/srep02412en_AU
dc.identifier.govdoc5041en_AU
dc.identifier.issn2045-2322en_AU
dc.identifier.journaltitleScientific Reportsen_AU
dc.identifier.urihttp://dx.doi.org/10.1038/srep02412en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5598en_AU
dc.identifier.volume3en_AU
dc.language.isoenen_AU
dc.publisherNature Publishing Groupen_AU
dc.subjectAnisotropyen_AU
dc.subjectMagnetic propertiesen_AU
dc.subjectMicroscopyen_AU
dc.subjectElectron microscopyen_AU
dc.subjectMaterialsen_AU
dc.subjectDiffractionen_AU
dc.titleThe antiferromagnetic structures of IrMn3 and their influence on exchange-biasen_AU
dc.typeJournal Articleen_AU
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