Abstract
We report temperature variations of the linewidth and resonance field for FMR in the reentrant ferromagnets a-FexNi80−xP14B6, x=11, 13, and 15. Microwave frequencies vary from 35 to 2 GHz and it is found that the anomalies, attendant upon approaching the FM-SG transition temperatures, are reduced when frequency is lowered. The results find satisfactory explanation in terms of a model coupling the resonating spins to magnetic two-level systems.
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