In nanostructured Sm2Fe17Nx+α-Fe two-phase permanent magnets, exchange interactions between hard and soft magnetic phases result in remanence enhancement. With a starting composition of Sm7Fe93, mechanical alloying, annealing at 625 °C for 10 min and subsequent nitriding at 330 °C for 45 h results in hard magnetic powder with nanocrystallites of Sm2Fe17N3 and α-Fe some 20 nm in size. There is a coercivity of μ0Hc=0.4 T and a remanence Jr=1.2 T, after saturating in a field of 7.5 T. The deduced value of the remanence depends strongly on the choice of demagnetizing factor.
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O’Donnell et al. (1994) studied this question.
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