On the law of approach to saturation in manganese-magnesium ferrite

The law of approach to saturation is studied for three differently porous samples of polycrystalline sintered Mn-Mg ferrite. Such an internal fieldH is sought that the dependenceI=I_s(1–a/H²) might be satisfied. The changes which occu rin such a dependence, if the fieldH is changed by a certain multiple of the magnetization, ere investigated by calculation. Relations are derived for this case, which are satisfied very well by the experimental values. The properties of the effective anisotropy constants ara dealt with and, on the basis of temperature measurements, these constants are ascribed with very great probability to the internal form anisotropy.

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- Mn-Mg- . , I= I_S(1-a/H²). , , . , . .

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Reported on in the form of preliminary results in the Institute of Semi-conductors, Academy of Sciences, USSR, in Leningrad on 17. 10. 1960.

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In conclusion the author would like to thank Dr. S. Krupika, C. Sc., K. Závta, C. Sc., grad. phys. R. Gerber and grad. phys. E. Kratochvílová for valuable discussions and A. Hadincová for help in the measurements and for carefully making the numerical calculations and graphs.