Abstract
We report the results of antiferromagnetic resonance (AFMR) measurements conducted onKCuF3 at various frequencies from 3.8 to 10.6 GHz at 4.2 K. The resonance linewidth is firstfound to depend on the frequency, i.e., the lower the frequency the greater theresonance linewidth, no matter whether the AFMR field is forced on the easyaxis or uneasy axis. Moreover, a linewidth peak seems to exist for at about 4 GHz. Based on the model of Yamada and Kato (1994 J. Phys. Soc. Japan 63 289)and considering the Laudau–Lifshitz damping term, the result of numerical calculation forthe resonance linewidth is in good agreement with the data of AFMR experiments.
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