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Physical Properties of Partially Crystallized Fe80B20 Amorphous Alloys

Published online by Cambridge University Press:  15 February 2011

D. Fiorani ,
F. Malizia ,
F. Ronconi  and
M. Vittori Antisari
D. Fiorani
Affiliation:
ICMAT-CNR, Area della Ricerca di Roma, C.P. 10, 00016 Monterotondo Stazione, Italy
F. Malizia
Affiliation:
INFM - Dipartimento di Fisica, Università di Ferrara, 1-44100 Ferrara, Italy
F. Ronconi
Affiliation:
INFM - Dipartimento di Fisica, Università di Ferrara, 1-44100 Ferrara, Italy
M. Vittori Antisari
Affiliation:
ENEA, Settore Nuovi Materiali, C.R.E. Casaccia, C.P.2400, 00100 Roma A.D., Italy
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Abstract

The magnetic properties and hyperfine fields were investigated at low temperatures on amorphous Fe80B20 ribbons crystallized at the end of the nucleation-and-growth process without involving coarsening process. The results obtained by SQUID magnetometer and Mössbauer spectrometer show that saturation magnetization and mean magnetic hyperfine field values are greater than those in both the parent amorphous phase and in the fully crystallized structure where coarsening and grain growth processes are involved. Below 200 K irreversibility is observed in low field magnetization measurements. Transmission electron microscopy measurements reveal that spherulites of Fe3B include a radial structure made of small bcc-Fe acicular crystals about 200 nm long and 10 nm wide. In our opinion, magnetic properties and hyperfine fields are ruled by both high magnetic anisotropy of small monodomain acicular bcc-Fe crystallites and the structure of Fe atoms located at their surfaces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 400: Symposium E – Metastable Metal-Based Phases and Microstructures , 1995 , 341
Copyright
Copyright © Materials Research Society 1996

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