Abstract
Magnetic-flux oscillations in a core made from lead-doped lanthanum manganite have been investigated. The core was located in crossed dc and radio-frequency ac magnetic fields. At a sufficiently large amplitude of the rf field, magnetic-flux jumps were observed and regions of ultrasharp oscillations of the magnetic flux appeared, which correspond to a bifurcation of a soft generation of a limit cycle. Flattened segments appeared in the oscillograms. The phenomena observed are qualitatively explained based on an analysis of processes of the dynamic magnetization reversal of the core along a minor hysteresis loop. The nonlinear phenomena, which indicate a complex dynamics of the magnetic-flux oscillations, exist in a moderately conducting ferromagnetic manganite only in a certain range of frequencies of the ac field, where the depth of a skin layer is comparable with the thickness of the core.
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