Interface effects on the magnetic moment of Co and Cu in CoCu granular alloys

We report on x-ray magnetic circular dichroism experiments performed on Co{sub 5}Cu{sub 95} annealed granular alloys with giant magnetoresistance. Results on the Co-L{sub 2,3} edge evidence a direct correlation between the Co orbital and spin magnetic moment and the Co clusters interfacial roughness...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2005-12, Vol.72 (21)
Main Authors: Garcia Prieto, A., Fdez-Gubieda, M.L., Chaboy, J., Laguna-Marco, M.A., Muro, T., Nakamura, T., Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza, 50009 Zaragoza, CITIMAC, Universidad de Cantabria, Avenida de los Castros s/n, 39005 Santander, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Mikazuki, Sayo, Hyogo 679-5148
Format: Article
Language:English
Subjects:
ANNEALING
ATOMS
COBALT ALLOYS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
COPPER ALLOYS
CORRELATIONS
FERROMAGNETIC MATERIALS
GRANULAR MATERIALS
INTERFACES
MAGNETIC CIRCULAR DICHROISM
MAGNETIC MOMENTS
MAGNETORESISTANCE
POLARIZATION
ROUGHNESS
SPIN
X RADIATION
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Summary:We report on x-ray magnetic circular dichroism experiments performed on Co{sub 5}Cu{sub 95} annealed granular alloys with giant magnetoresistance. Results on the Co-L{sub 2,3} edge evidence a direct correlation between the Co orbital and spin magnetic moment and the Co clusters interfacial roughness. On the other hand, we have found dichroism on the Cu-L{sub 2,3} edge, revealing an induced magnetic polarization of the Cu interfacial atoms. The magnetic moment of the Cu atoms is mainly of spin character and is ferromagnetically coupled with the Co magnetic moment.
ISSN:1098-0121
1550-235X
DOI:10.1103/PHYSREVB.72.2