Abstract
The Curie temperature relaxation behavior in two amorphous ferromagnetic alloys (Fe10Co55Ni35)78Si8B14 and Fe40Ni40P14B6 (Metglas 2826) subjected to annealing at pressures up to 2 GPa is investigated. A comparison of the relaxed amounts of TC due to isothermal and isochronal annealings at 0, 1, and 2 GPa shows a delaying effect on the relaxation process during high-pressure annealing, while the concomitant kinetics of the processes remains unchanged. The pressure-induced percentage reductions in TC relaxation are estimated to be 8% and 12% per GPa, respectively. The reversible relaxation behavior was found still present during high-pressure annealing, but with a reduced amplitude. By annealing between high and low pressures at fixed temperature, some regenerative relaxation behavior was observed after every completion of the cyclic pressures. The obtained results may be explained by pressure-induced narrowing of regions in the amorphous structure. It is suggested that these extended regions are the main locations where the compositional short-range ordering contributed to TC relaxation.
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