Magnetic properties and giant magnetoresistance of magnetic granular Co10Cu90 alloys obtained by direct-current joule heating

R. H. Yu*, X. X. Zhang, J. Tejada, J. Zhu, M. Knobel, P. Tiberto, P. Allia, F. Vinai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The direct-current (dc) joule heating technique was exploited to fabricate giant magnetoresistance (GMR) Co10Cu90 granular alloys. The Co cluster precipitation process was investigated by calorimetric and x-ray diffraction measurements. At T=10 K, the largest MR change of 25.0% has been observed for the melt-spun Co10Cu90 ribbon annealed at I=5 A. The magnetoresistance scales approximately as the inverse Co particle size. At room temperature, it was found that the dc joule-heated samples show relatively high GMR in comparison with furnace-annealed samples. Based on the phenomenological GMR model, we assumed that it is a consequence of smaller Co particles formed in dc joule-heated samples.

Original languageEnglish (US)
Pages (from-to)5062-5066
Number of pages5
JournalJournal of Applied Physics
Volume78
Issue number8
DOIs
StatePublished - Dec 1 1995

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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