Abstract
Spin-wave relaxation rate in the quasi-two-dimensional ferromagnet (CH 3 NH 3 ) 2 CuCl 4 are studied by parallel pumping experiment. Magnon relaxation rate is determined as a function of wave number from zero to the Brillouin-zone-boundary in the direction perpendicular to the ferromagnetic layers and as a function of θ k , which is the angle between the magnon wave vector and the direction of the static magnetic field. Temperature dependence of the relaxation rate is proportional to T 2 . Magnetic excitation is found at frequencies below the spin-wave band. Phonon bottleneck effect is discussed to explain the magnon relaxation in this crystal.
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