Abstract
The temperature dependence of hyperfine interactions has been studied by means of Mössbauer spectroscopy for rapidly quenched amorphous Fe92Zr8 in as-quenched and partially crystallized states. An analysis of the temperature dependence of the mean hyperfine field based on the molecular-field approximation showed that the Curie temperature of the residual intergranular amorphous phase (TCam) is 330±5 K, well above the maximum Curie temperature in amorphous Fe–Zr binary alloys (TC*≈280 K). The difference of TCam−TC* (ΔTCam≈50 K) cannot be attributed to the possible magnetovolume effect in the sample. The difference of ΔTCam could be explained by an enhancement of the molecular field by ∼50 T at 0 K, induced by the Fe exchange field penetrating from the bcc-Fe nanocrystallites.
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