Abstract
Possibility of the exchange-spring magnets in the Sm-Fe-(C, N) system has been studied by preparing the microduplex structure consisting of a nanocrystalline soft magnetic α-Fe phase and a hard magnetic Sm 2 Fe 17 (C, N) x phase. In this study, the microduplex structure was prepared by annealing the melt-spun ribbons in the amorphous state. The magnetic properties of annealed Sm y Fe 95-y C 5 (y=5-10) ribbons after nitriding, whose Sm contents were lower than the stoichiometric composition of Sm 2 Fe 17 C, were investigated in correlation to their microstructures. In the as-spun state, Sm 7-10 Fe 85-88 C 5 (y=7-10) ribbons consist only of the amorphous phase, while in the Sm 5 Fe 90 C 5 (y=5) and Sm 6 Fe 89 C 5 (y=6) ribbons an α-Fe phase is also observed. The α-Fe phase in the ribbons withy= 5 and 6 can be formed by the crystallization during melt-quenching. In all cases, the amorphous phase disappears after the annealing above 600 o C, resulting in the microduplex structure with α-Fe and Sm 2 Fe 17 C x phases. Relatively high coercivities were observed in the Sm 7-10 Fe 85-88 C 5 ribbons after annealing and subsequent nitriding. Especially, the Sm 7 Fe 88 C 5 ribbon annealed at 600 o C for 5 min and subsequently nitrided at 450 o C for 4 h exhibits the coercivity of 269 kAm -1 with the maximum energy product of 70.1 kJm -3
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