Ferromagnetic Resonance in Various Ferrites at Low and High Temperatures

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Ferromagnetic resonances in manganese, copper, and magnesium ferrites and nickel-zinc binary ferrites were tried at low and high temperatures at the frequency of 9310 MC ; in the temperature range of magnetic transition for manganese ferrite, double peaks were observed ; with lowering of the temperature, a small peak at low field overlapped the ordinary large peak showing an asymmetrical resonance curve which tended to be symmetrical at the lowest temperature. g-factors and the half line widths were determined up to the Curie temperatures. In general, the line width of simple ferrites decreases monotonously to the Curie temperature, but those of binary ferrites containing zinc ferrite first decreases rapidly with rising temperature from the liquid nitrogen temperature and then increases near the Curie temperature ; especially, it is most interesting to notice that the curve of line width versus temperature for high zinc ferrite in Zinc-Nickel ferrites shows minimum and maximum, the behaviour seems to correspond to a type predicted by Neel, which appears in the diagram for saturation magnetization versus temperature. Moreover, we could determined g-factor of various Ni-Zn binary ferrites just at Curie point, by using paramagnetic resonance condition ; the value of g-factor monotonously decreases with increasing content of zinc ferrite. The fact is quite in contradistinction to the change of g-value with varying zinc content in Zn-Ni ferrites at room and low temperatures. The size effect reported by Beljers and Polder could not be observed for nickel ferrite and Ni-Zn binary ferrite at the frequency of 9310 Mc/sec., but recently it was observed at 23, 500 Mc/sec. at room and low temperature on several ferrites.
東北大学の論文

Ferromagnetic Resonance in Various Ferrites at Low and High Temperatures

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