Competing anisotropies in bcc Fe81Ni19/Co(001) superlattices

Hafermann, H.; Brucˇas, R.; Soroka, I. L.; Katsnelson, M. I.; Iuşan, D.; Sanyal, B.; Eriksson, O.; Hjörvarsson, B.
February 2009
Applied Physics Letters;2/16/2009, Vol. 94 Issue 7, pN.PAG
Academic Journal
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.


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