Fe 50+x Pt 50−x (x=0,5,10.5) powders obtained by mechanical ball milling at liquid nitrogen temperature are investigated. The phase composition, chemical order, and magnetic properties are studied as a function of composition and annealing conditions. The annealed powders contain a mixture of the highly ordered L10 FePt, disordered FePt, as well as Fe3Pt and FePt3 phases. The highest coercivity of 0.7 T was achieved in the Fe50Pt50 powder annealed at 450 °C for 48 h. The annealed FePt powders have a lamellar microstructure with grains of about 40 nm. Coercivity increases with increasing L10 volume fraction and degree of chemical order.
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Lyubina et al. (2004) studied this question.
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