Phase and particle size distribution in magnetoresistive Fe-Cu granular alloys investigated by Mossbauer spectroscopy

The size distribution of ferromagnetic particles in granular Fe-Cu alloys is derived from the hyperfine field distribution of super(57)Fe Mossbauer spectra, on the grounds of collective magnetic excitations associated with the spectral line broadening. A good agreement with the X-ray diffraction res...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 1996-11, Vol.163 (3), p.257-263
Main Authors: Rogalski, M S, Azevedo, M M P, Sousa, J B
Format: Article
Language:English
Online Access:Get full text
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Summary:The size distribution of ferromagnetic particles in granular Fe-Cu alloys is derived from the hyperfine field distribution of super(57)Fe Mossbauer spectra, on the grounds of collective magnetic excitations associated with the spectral line broadening. A good agreement with the X-ray diffraction results is found for the average particle size estimated from the Mossbauer data. The magnetoresistance of a splat-cooled Fe sub(25)Cu sub(75) alloy reaches a maximum of 3% after appropriate annealing and its evolution is correlated with the various Fe phases (ferro, para and superparamagnetic) and particle sizes identified by the Mossbauer data.
ISSN:0304-8853
DOI:10.1016/S0304-8853(97)80004-2