Ferromagnetic resonance at room temperature is measured on amorphous (Fe1−xNix)80P10B10 very thin wires with 0.74 ≦ x ≦ 0.84. FMR measurements in the frequency range from 9.2 to 70 GHz are supplemented by static measurements of magnetization. With increasing Ni content, x, the Curie temperature decreases passing room temperature at approximately x = 0.80. Near this composition the resonance linewidth rapidly increases and its frequency dependence significantly changes. FMR data in the vicinity of Tc can be explained by a combination of two relaxation terms in the equation of motion and a g-factor dependent on applied magnetic field.
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Kraus et al. (1981) studied this question.
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