Volume 59, Number 6, September II 2002
|Page(s)||855 - 861|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Direct experimental evidence of an anomalous segregation in - granular alloys and its influence on magnetoresistance
Departamento de Electricidad y Electrónica,
Universidad del País Vasco Apartado 644, E-48080
2 Istituto Nazionale di Fisica della Materia (INFM), c/o ESRF GILDA CRG B.P. 220, F-38043 Grenoble, France
3 Dipartimento di Fisica “E. Amaldi”, Università di Roma Tre Via della Vasca Navale 84, I-00146 Roma, Italy
4 Laboratori Nazionali di Frascati (INFN) - P.O. Box 13, I-00044 Frascati, Italy
Accepted: 1 July 2002
In - metastable alloys, suitable thermal treatments create nanoclusters that are responsible for the giant magnetoresistance phenomena. A detailed microscopic study by means of high-resolution X-ray diffraction and extended X-ray absorption spectroscopy has revealed an anomaly in the thermally induced segregation process, occurring at the same temperature regardless of the sample composition. This phenomenon roughens the nanocluster interface and degrades the sample magnetotransport properties.
PACS: 61.46.+w – Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals / 61.10.Ht – X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc / 75.70.Pa – Giant magnetoresistance
© EDP Sciences, 2002
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