Abstract
The X-band antiferromagnetic resonance spectrum of KMnF 3 with impurities Fe 2+, Co 2+ and Ni 2+ has been studied at temperatures from 20 K to T N. The admixture of 3d ions dramatically influence the AFMR of KMnF 3. The admixtures containing 0.4 at% Fe 2+ and 1.0 at% Co 2+ cause a decay of resonance mode within an interval of 2 K below T N. In this work, the X-band AFMR of crystals KMn 0.99Ni 0.01F 3 and KMnF 3:Fe was examined. A broadening of the resonance linewidth and “anomalous” temperature relationship are probably caused by a spin-lattice relaxation through ion relaxation processes.
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