Microstructure à fine échelle d’alliages à propriétés de magnétorésistance géante

Download or read book Microstructure à fine échelle d’alliages à propriétés de magnétorésistance géante written by Sophie Cazottes and published by . This book was released on 2008 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: A magnetoresistive material is a material whose electrical restistance varies when a magnetic fiel is applied. The aim of this study is to link the different structural parameters with magnetic and giant magnetoresistance properties of granular Cu80FexNi20-x (at%) ribbons. First part, the effect of the composition os presented. Then, the microstructure of a Cu80Fe10Ni10 (at%) ribbon, presenting the highest magnetoresistance, was characterized precisely from a micrometer scale dow, to an atomic scale. The sample consists of fcc (Fe,Ni)-rich precipitates coherent with the matrix rich in copper. The study og the magnetic properties of this ribbon has shown that magnetic interactions are present that reduce MRG. Structural data (size and composition distributions, precipitates volume fractions and density, interface width...) were correlated with magnetic properties.