The direct-current (de) joule heating technique was exploited to fabricate giant magnetoresistance (GEAR) 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 de 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 de joule-heated samples. (C) 1995 American Institute of Physics.

Magnetic properties and giant magnetoresistance of magnetic granular Co10 Cu90 alloys obtained by direct‐current joule heating / R. H., Yu; X. X., Zhang; J., Tejada; J., Zhu; M., Knobel; P., Tiberto; Allia, PAOLO MARIA EUGENIO ICILIO; F., Vinai. - In: JOURNAL OF APPLIED PHYSICS. - ISSN 0021-8979. - 78:8(1995), pp. 5062-5066. [10.1063/1.359735]

Magnetic properties and giant magnetoresistance of magnetic granular Co10 Cu90 alloys obtained by direct‐current joule heating

ALLIA, PAOLO MARIA EUGENIO ICILIO;
1995

Abstract

The direct-current (de) joule heating technique was exploited to fabricate giant magnetoresistance (GEAR) 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 de 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 de joule-heated samples. (C) 1995 American Institute of Physics.
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