Atomic interdiffusion between FePt and Fe 3 O 4 nanoparticles in annealed FePt-based nanocomposite magnets has been studied by means of structural and magnetic characterizations. The results show that the Fe 3 Pt phase is formed during the annealing only when the mass ratio x of Fe 3 O 4 /FePt is larger than 1/20. When x ≤ 1/20, only FePt single phase is formed. It is interesting to find that the coercivity of the annealed samples increases with a small addition of Fe 3 O 4 before the formation of the Fe 3 Pt phase. This magnetic hardening behaviour indicates that the composition of the FePt phase can be further adjusted via the post annealing process. The characteristic of recoil loops and Henkel plots also give evidence for the transition from single-phase FePt magnets to nanocomposite magnets with the addition of Fe 3 O 4 .
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Rong et al. (2007) studied this question.
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