Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1998-12-17
Laser Phys. 8 (1998) 1029-1038
Physics
Condensed Matter
Statistical Mechanics
1 file, 17 pages, LaTex, no figures
Scientific paper
Spin dynamics of a polarized spin system is studied when the latter is coupled with a resonant electric circuit and is under the action of an external pumping supporting a stationary nonequilibrium magnetization. A complete classification of possible regimes of spin motion is given. In addition to seven regimes considered earlier, two other transient regimes are found and thoroughly described: One is an oscillatory regime, when spins always move coherently but the degree of coherence fluctuates with time. Another is a pulsing regime, when spins reveal coherent motion during short pulses separated from each other by intervals of incoherent motion. These regimes are, in principle, transient, although may be extremely long lasting; their duration may be several orders longer than the transverse relaxation time and twice longer than the longitudinal relaxation time. Both transient regimes end with a coherent quasistationary regime.
Yukalov V. I.
Yukalova E. P.
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