Magnetic Properties of Mn_xFe_<3-x>O_4 made from the Melt

概要

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Initial permeability, μ_i, with its time dependence and magnetization curve were measured at room temperature for Mn_xFe_<3-x>O_4 (x=0.4, 0.6, 0.75, 0.95, 1.05 and 1.15) made from the melt in the air atmosphere. No disaccomodation was observed for x=0.6～1.05, contrary to the result for Mn_<0.84>Fe_<2.14>O_4 obtained by ENZ, while a fairly large disaccomodation for x=0.4. It is not explained by an electron diffusion mechanism but by a role of cation vacancy. Composition dependence of μ_i had a maximum at x=0.95 and its value was about ten times larger at 1kc/s than that of sintered ferrite with nearly the same composition. This composition does not correspond to small K_1 but to small λ_<111・> Coercive force and remanent magnetization were about one order of magnitude small compared with those of sintered ferrites. These results show a restrictive effect of pores to domain wall motion.
横浜国立大学の論文