Geodesic
Fokker--Planck method in the theory of parametric resonance of spin waves
Teoretičeskaâ i matematičeskaâ fizika, Tome 90 (1992) no. 2, pp. 278-300

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A system of parametric spin waves interacting with a thermal reservoir is considered. A generalized Fokker–Planck equation for the distribution function $f(a,t)$, of the amplitudes of the parametric spin waves in a ferromagnet is constructed. An equation for the distribution function $F(n,\sigma,t)$ of pairs of parametric spin waves is obtained on the basis of this equation using the idea of a reduced description. Approximate stationary solutions of the equation for the distribution function $F(n,\sigma)$ are found in the pre-threshold and post-threshold states. 
@article{TMF_1992_90_2_a11,
     author = {V. G. Morozov and A. N. Mukhai},
     title = {Fokker--Planck method in the theory of parametric resonance of spin waves},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {278--300},
     publisher = {mathdoc},
     volume = {90},
     number = {2},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1992_90_2_a11/}
}
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V. G. Morozov; A. N. Mukhai. Fokker--Planck method in the theory of parametric resonance of spin waves. Teoretičeskaâ i matematičeskaâ fizika, Tome 90 (1992) no. 2, pp. 278-300. http://geodesic.mathdoc.fr/item/TMF_1992_90_2_a11/