Correlation between magnetotransport properties and the microstructure of the Co 20Cu 80 granular alloy

We report on the structural, transport and magnetic properties of Co 20Cu 80 metallic granular films. The granular films are prepared by ion-beam sputtering at room temperature on glass substrates. The structural properties have been investigated using X-ray diffraction and transmission electron mic...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 238; no. 2; pp. 145 - 154
Main Authors Errahmani, H, Berrada, A, Schmerber, G, Dinia, A
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2002
Subjects
Giant magnetoresistance
Granular alloys
Superparamagnetism
75.70.Pa
75.70.−i
Granular alloys
Giant magnetoresistance
Superparamagnetism
75.30.Cr
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Summary:We report on the structural, transport and magnetic properties of Co 20Cu 80 metallic granular films. The granular films are prepared by ion-beam sputtering at room temperature on glass substrates. The structural properties have been investigated using X-ray diffraction and transmission electron microscopy. Structural characterisation confirmed that the samples consist of fine magnetic particles embedded in the non-magnetic Cu matrix. Giant magnetoresistance (GMR) of 3% is observed at room temperature after annealing at 250°C for 30 min. Detailed structural analysis is performed to understand the origin of the small GMR signal. It is confirmed that this result is directly correlated to the small size, density, and non-uniform distribution of Co particles.
ISSN:0304-8853
DOI:10.1016/S0304-8853(01)00828-9