Abstract

The problem of cross-relaxation in a spin S = 1 ferromagnet with uniaxial single-ion anisotropy is investigated. The longitudinal dynamic susceptibility is evaluated and discussed as a function of both the applied static magnetic field and the temperature. It is found that cross-relaxation may exist throughout the whole spin-wave region, even for low temperatures. The general results are analysed in more detail for two significant temperature regions. For low temperatures, where k B T is of the same order of magnitude as the spin-spin interactions, strongly asymmetric field dependences appear. For the high-temperature range of the spin-wave region, the relation to paramagnetic cross-relaxation is established.

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