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Magnetic interactions and phase transformations in FeM, M = (Pt, Rh) ordered alloys

We present results of the first-principles calculations for selected non-collinear magnetic configurations in L10 FePt and B2 FeRh. These results have been interpreted within the unified model of magnetic interactions which treats the Fe atomic moments as sufficiently localized degrees of freedom. The exchange fields of Fe atomic moment determine both the orientation and the value of the induced Rh/Pt atomic moments. The Pt moment fluctuations in FePt follow a relatively simple form while for the FeRh significant contributions of the non-linear susceptibility have to be taken into account. The latter, along with the remarkably strong Rh mediated exchange lead to a dominating contribution from the bi-quadratic non-Heisenberg terms. The effect of magnetic interactions mediated by the induced Rh/Pt moment on the order-order (FeRh) and order disorder (FePt) magnetic phase transition is discussed.