Abstract
Ferromagnetic resonance and parallel pumping experiments in K 2 CuF 4 are investigated at 9 GHz and in the temperature range from 4.2 to 1.4 K. Temperature dependence of a weak fourfold anisotropy in the c -plane is measured. The anisotropy field extrapolated to T =0 K is 5 Oe. Resonance linewidth Δ H 0 and spin-wave linewidth Δ H k have also fourfold anisotropy.
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