Abstract
Fe–Pt–Mn thin films were deposited on quartz plates at a substrate temperature of 25–800°C. Three alloy compositions were studied, including Fe51Pt42Mn7, Fe51Pt45Mn4, and Fe41Pt55Mn4. X-ray diffraction data indicate that the addition of Mn stabilizes the FCC FePt disordered phase, and increases the ordering transformation temperature by ∼150°C. At high annealing temperatures, the decrease of d111 lattice spacing for ordered FePt phase implies that Mn atoms dissolve into FCT phase to form a solid solution. The coercivities of Fe–Pt–Mn thin films were found to decrease with the increasing d111 lattice spacing.
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