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 (TamC) is 330±5 K, well above the maximum Curie temperature in amorphous Fe-Zr binary alloys (T*C ≈ 280K). The difference of TamC-T*C (ΔTamC≈50 K) cannot be attributed to the possible magnetovolume effect in the sample. The difference of ΔTamC 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.
|Number of pages||3|
|Journal||Journal of Applied Physics|
|Issue number||9 III|
|Publication status||Published - 1 May 2000|