Abstract
Extensive ferromagnetic resonance (FMR) measurements have been performed in the critical region on amorphous Fe90Zr10 and Fe91Zr9 alloys before and after they have undergone isothermal annealing at 400 K for durations of time ranging from 10 to 240 min. Saturation magnetization MS and resonance field Hres as functions of temperature in the critical region are accurately determined by a detailed lineshape analysis of the observed FMR spectra. The 'range-of-fit' scaling-equation-of-state analysis is then employed to arrive at the asymptotic values of the spontaneous magnetization and initial susceptibility critical exponents beta and gamma from the MS(Hres,T) data so obtained. Isothermal annealing causes a significant enhancement in the Curie temperature TC, but leaves the values of the exponents beta and gamma , which are fairly close to those predicted by the three-dimensional Heisenberg model, unaltered. The FMR linewidth versus temperature curves exhibit an abrupt slope change at TC, indicating a well-defined phase transition from the ferromagnetic to the paramagnetic state.
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