Abstract
A high coercivity of 11 kOe has been obtained in spark plasma sintered and hot-deformed Fe 53Pt 44C 3 bulk magnets. The origin for the high coercivity has been investigated using X-ray diffraction and transmission electron microscopy. The average grain size of the ordered phase was ∼100 nm, which is less than the single domain size of the L1 0-FePt phase. Fe 3C particles were found surrounding the L1 0-FePt grains, which suppress the grain growth. The L1 0 ordering is also found to increase in hot-deformed sample by annealing in a magnetic field of 10 T at 600 °C.
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