Nonlinear dynamics of nuclear–electronic spin processes in ferromagnets

Spin dynamics is considered in ferromagnets as consisting of electron and nuclear subsystems interacting with each other through hyperfine forces. In addition, the ferromagnetic sample is coupled with a resonance electric circuit. Under these conditions, spin relaxation from a strongly nonequilibrium initial state displays several peculiarities that are absent in the standard setup for studying spin relaxation. The main feature of the nonlinear spin dynamics considered in this article is the appearance of ultrafast coherent relaxation, with characteristic relaxation times several orders shorter than the transverse relaxation time T2. This type of coherent spin relaxation can be used for extracting additional information on the intrinsic properties of ferromagnetic materials and can also be employed for different technical applications.Spin dynamics is considered in ferromagnets as consisting of electron and nuclear subsystems interacting with each other through hyperfine forces. In addition, the ferromagnetic sample is coupled with a resonance electric circuit. Under these conditions, spin relaxation from a strongly nonequilibrium initial state displays several peculiarities that are absent in the standard setup for studying spin relaxation. The main feature of the nonlinear spin dynamics considered in this article is the appearance of ultrafast coherent relaxation, with characteristic relaxation times several orders shorter than the transverse relaxation time T2. This type of coherent spin relaxation can be used for extracting additional information on the intrinsic properties of ferromagnetic materials and can also be employed for different technical applications.