Abstract
Based on the two-level model and the unified theory of low frequency relaxation processes for condensed matter, we studied the magnetic after-effect spectrum in the temperature range between 250 and 350 K for the amorphous Fe 50Ni 30B 20 alloy after an annealing treatment for 2 h at 480 K. The calculated infrared infrared divergence exponent n = 0.11, and the characteristic relaxation time τ ∞ = 2.8 × 10 −17 s. The apparent activation energy E A obtained at the temperature of the relaxation peak is about 1.7 eV. These values are in good agreement with experiments. The calculations indicate that for this amorphous alloy, the magnetic after effects are caused by local rearrangement of atom pairs FeB and NiB caused by jumps of B atoms.
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