Abstract
The spin-wave resonance spectrum is calculated for the thin film of an FeBr2 field-induced metamagnet, which consists of ferromagnetically ordered layers parallel to the (001)-plane, with intralayer ferromagnetic exchange coupling, interlayer antiferromagnetic exchange coupling as well as a strong three-ion anisotropy. The profiles of the spin-wave modes, the positions of the absorption lines and their intensities are analysed for standing spin waves existing in the paramagnetic phase of the FeBr2 metamagnet at low temperatures. It is found that the absorption spectrum is strongly affected by modifications of both surface exchange parameters. By allowing the surface parameters to deviate from the bulk values, the full richness of spin-wave resonance spectra is displayed. Also, the conditions for the appearance of various surface and bulk spin-wave features are discussed.
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