In the present paper, the relation between irreversible magnetic properties of natural magnetite polycrystals and the frequency of a magnetic field in the range of frequencies 50-10$^{5}$ Hz is studied. An amplification of the degree of magnetization with an increase in the frequency of the magnetizing field, beginning with frequencies on the order of several hundred hertz, is observed for all the types of remanent magnetization studied (normal, Ideal, and natural). The resulting effect is attributed to the influence of a magnetic-diffusion type barrier on the magnetic structure of the samples.
Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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