Abstract
The ferromagnetic resonance technique was used to study the annealing behavior of the metallic glass Fe 40Ni 40P 14B 6 (Metglas 2826). The peak-to-peak FMR linewidth, Δ H pp, was measured at room temperature and 9.5 GHz for several times of isothermal annealing in the temperature range 350–375°C. After an initial decrease, attributed to structural relaxation, the linewidth increases with annealing time for all temperatures investigated. The activation energy for crystallization, E c, is estimated from the times to Δ H pp = 20 to 80 mT as (412±23) kJ/mol. The results suggest that, for sufficiently long annealing times, there is a well-defined relation between Δ H and the volume fraction of the transformed phase. If this relation is assumed to be linear, the transformed fraction, as derived from linewidth data, satisfies the Johnson-Mehl-Avrami equation with the exponent n equal to 1.67±0.13.
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