Magnetism: the Driving Force of Order in CoPt. A First-Principles Study

Details Magnetism: the Driving Force of Order in CoPt. A First-Principles Study Magnetism: the Driving Force of Order in CoPt. A First-Principles Study

2012-04-26

arxiv.org/abs/1204.5845v1

Physics

Condensed Matter

Materials Science

Scientific paper

CoPt or FePt equiatomic alloys order according to the tetragonal L10 structure which favors their strong magnetic anisotropy. Conversely magnetism can influence chemical ordering. We present here {\it ab initio} calculations of the stability of the L10 and L12 structures of Co-Pt alloys in their paramagnetic and ferromagnetic states. They show that magnetism strongly reinforces the ordering tendencies in this system. A simple tight-binding analysis allows us to account for this behavior in terms of some pertinent parameters.

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