Friday, April 27, 2012

1204.5845 (Sondes Karoui et al.)

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

Sondes Karoui, Hakim Amara, Bernard Legrand, François Ducastelle
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.
View original: http://arxiv.org/abs/1204.5845

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