Effect of Fe-exchange-field penetration on the residual amorphous phase in nanocrystalline Fe92Zr8

K. Suzuki, J. M. Cadogan

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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 (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.

Original languageEnglish
Pages (from-to)7097-7099
Number of pages3
JournalJournal of Applied Physics
Volume87
Issue number9 III
Publication statusPublished - 1 May 2000

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