Specific heat and magnetization studies of spin-glass like transition in nanogranular Cu sub(90)Co sub(10) ribbon

Low temperature measurements of specific heat and magnetic properties were performed on granular Cu sub(90)Co sub(10) ribbons prepared by melt spinning technique. The thermal and magnetic behavior of an as-quenched sample is compared to that of an annealed sample at 500 [degrees]C for 1 h. It was fo...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 370; pp. 116 - 121
Main Authors Nunes, W C, Gomes, A MS, Rapp, R E, Novak, M A
Format Journal Article
LanguageEnglish
Published 01.12.2014
Subjects
Annealing
ANNEALING PROCESSES
COPPER ALLOYS (40 TO 99.3 CU)
COPPER COBALT ALLOYS
ELECTRONIC PRODUCTS
Electronics
GLASSES
MAGNETIC PROPERTIES
Magnetization
Melt spinning
Nanoparticles
PARTICLES
PROPERTIES
Ribbons
Specific heat
SPINNING
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Summary:Low temperature measurements of specific heat and magnetic properties were performed on granular Cu sub(90)Co sub(10) ribbons prepared by melt spinning technique. The thermal and magnetic behavior of an as-quenched sample is compared to that of an annealed sample at 500 [degrees]C for 1 h. It was found that the electronic specific heat gamma decreases about 50% and the magnetic properties change from spin-glass to superparamagnetic with the annealing process. These results are interpreted and discussed considering the role of isolated Co atoms in the RKKY interaction among small nanoparticles.
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ISSN:0304-8853
DOI:10.1016/j.jmmm.2014.06.028