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Remanence enhancement in composite magnets of micrometre Sm-Fe-N grains and nanometre Fe particles

We report the hard magnetic behaviour of composite magnets prepared by directly mixing micrometre Sm-Fe-N grains with micrometre iron particles and nanometre iron particles, respectively. Remanence enhancement has been found in composite magnets prepared by directly mixing the micrometre Sm-Fe-N grains with nanometre iron particles. Our experimental results indicate that for remanence enhancement to occur in composite materials the size of the soft magnetic phase involved must be nanometre, while the particle size of the hard magnetic phase involved need not be limited to nanometre scales.