Nonlinear Spin Dynamics in Ferromagnets with Electron-Nuclear Coupling

Details Nonlinear Spin Dynamics in Ferromagnets with Electron-Nuclear Coupling Nonlinear Spin Dynamics in Ferromagnets with Electron-Nuclear Coupling

1999-07-13

arxiv.org/abs/cond-mat/9907188v1

Phys. Rev. B 60 (1999) 1227-1237

Physics

Condensed Matter

1 file, LaTex, 23 pages

Scientific paper

10.1103/PhysRevB.60.1227

Nonlinear spin motion in ferromagnets is considered with nonlinearity due to three factors: (i) the sample is prepared in a strongly nonequilibrium state, so that evolution equations cannot be linearized as would be admissible for spin motion not too far from equilibrium, (ii) the system considered consists of interacting electron and nuclear spins coupled with each other via hyperfine forces, and (iii) the sample is inserted into a coil of a resonant electric circuit producing a resonator feedback field. Due to these nonlinearities, coherent motion of spins can develop, resulting in their ultrafast relaxation. A complete analysis of mechanisms triggering such a coherent motion is presented. This type of ultrafast coherent relaxation can be used for studying intrinsic properties of magnetic materials.

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