Static magnetic field measurements have been reported on amorphous metal alloys of (Fe0.82B0.18)0.90La0.05R0.05, where R=La, Pr, Nd, Sm, Gd, Tb, Dy, Ho, and Er. Microwave properties of these alloys are now reported. The microwave measurements consisted of fixed (9 GHz) and swept (0.01–18 GHz) frequency magnetic resonance experiments. The ferromagnetic resonance (FMR) linewidth, ΔH and g factor were measured. ΔH has a minimum for R=Gd and is equal to 100 Oe. ΔH appears to scale with 〈L⋅S〉 where L and S are the spin and orbital angular momentum operators of the R ion. The measured g factor obeys the Wangsness relation, as R is varied.
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Vittoria et al. (1984) studied this question.
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