Competing anisotropies in bcc Fe81Ni19/Co(001) superlattices

A magnetization reorientation transition has been observed in Fe81Ni19/Co(001) superlattices by means of magneto-optical Kerr effect and magnetic force microscopy measurements. The transition is driven by the variation of the interface density. First-principles calculations are combined with a linea...

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Veröffentlicht in:	Applied physics letters 2009-02, Vol.94 (7), p.073102/1
Hauptverfasser:	Hafermann, H., Bručas, R., Soroka, I. L., Katsnelson, M. I., Iuşan, D., Sanyal, B., Eriksson, O., Hjörvarsson, B.
Format:	Artikel
Sprache:	eng
Schlagworte:	iron nickel superlattice cobalt magnetic anisotropy magnetization reorientation transition
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Beschreibung
Zusammenfassung:	A magnetization reorientation transition has been observed in Fe81Ni19/Co(001) superlattices by means of magneto-optical Kerr effect and magnetic force microscopy measurements. The transition is driven by the variation of the interface density. First-principles calculations are combined with a linear stability analysis of the Landau–Lifshitz equation to clarify the mechanism that drives the transition. We are able to identify it as being driven by competing interface in-plane and uniaxial bulk out-of-plane anisotropies. The origin of the bulk anisotropy is attributed to tetragonal distortions experimentally observed in these superlattices.
ISSN:	0003-6951 1077-3118 1077-3118
DOI:	10.1063/1.3081107