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Spin dynamics is considered in ferromagnets consisting of electron andnuclear subsystems interacting with each other through hyperfine forces. Inaddition, the ferromagnetic sample is coupled with a resonance electriccircuit. Under these conditions, spin relaxation from a strongly nonequilibriuminitial state displays several peculiarities absent for the standard set-up instudying spin relaxation. The main feature of the nonlinear spin dynamicsconsidered in this communication is the appearance of ultrafast coherentrelaxation, with characteristic relaxation times several orders shorter thanthe transverse relaxation time $T_2$. This type of coherent spin relaxation canbe used for extracting additional information on the intrinsic properties offerromagnetic materials and also can be employed for different technicalapplications.Comment: 1 file, 4 pages, RevTex, no figure

Nonlinear dynamics of nuclear–electronic spin processes in ferromagnets