Abstract

The antiferromagnetic resonance spectrum of ${\mathrm{KNiF}}_{3}$ has been studied at temperatures close to ${T}_{N}$=247 K. Each spectrum consists of a very broad line and the line shape has been analyzed in terms of the Landau-Lifshitz phenomenological equations. The spectrum disappears at T\ensuremath{\sim}230 K, a fact which, we suggest, is caused by the reorientation of the antiferromagnetic domains.

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