High-pressure torsion for production of magnetoresistance in Cu–Co alloy

The process of high-pressure torsion (HPT) was applied to control the size and distribution of ferromagnetic Co particles in a Cu–Co alloy. Electron probe microanalysis, X-ray diffraction analysis, and transmission electron microscopy confirmed that the Co particles were significantly refined throug...

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Bibliographic Details
Published in:Journal of materials science 2008-12, Vol.43 (23-24), p.7349-7353
Main Authors: Suehiro, Kenichiro, Nishimura, Shunichi, Horita, Zenji, Mitani, Seiji, Takanashi, Koki, Fujimori, Hiroyasu
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Classical Mechanics
Cobalt base alloys
Crystallography and Scattering Methods
Electron probe microanalysis
Electron probes
Electrons
Ferromagnetism
Giant magnetoresistance
High pressure
Magnetoresistance
Magnetoresistivity
Materials Science
Metallurgy
Polymer Sciences
Solid Mechanics
Torsion
Transmission electron microscopy
Ultrafine-Grained Materials
X-ray diffraction
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Summary:The process of high-pressure torsion (HPT) was applied to control the size and distribution of ferromagnetic Co particles in a Cu–Co alloy. Electron probe microanalysis, X-ray diffraction analysis, and transmission electron microscopy confirmed that the Co particles were significantly refined through fragmentation and dissolved with intense straining by HPT. Magnetoresistance appeared by ~2.5% at 77 K with an isotropic feature corresponding to giant magnetoresistance (GMR). It is demonstrated that HPT is a potential process for creating GMR in the Cu–Co alloy prepared by conventional ingot metallurgy.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-008-2813-9