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Giant magnetoresistance in magnetic granular Co15Cu85alloys annealed by direct-current Joule heating

Authors
Journal
Journal of Magnetism and Magnetic Materials
0304-8853
Publisher
Elsevier
Publication Date
Volume
164
Identifiers
DOI: 10.1016/s0304-8853(96)00357-5

Abstract

Abstract We have studied the structure and giant magnetoresistance (GMR) in the Co 15Cu 85 granular alloys prepared by melt-spinning and annealed by the direct-current (dc) Joule heating. At T = 10 K, GMR as large as 50.0% (in a magnetic field up to 30 kOe) has been observed in a sample annealed with I = 6 A. The Joule-heated samples show higher GMR than those annealed by the conventional method. It is attributed to less content of residual Co in the Cu matrix for the dc Joule-heated samples than that for the samples annealed in a furnace.

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