High-pressure torsion for production of magnetoresistance in Cu–Co alloy
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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.
KeywordsElectric Discharge Machine Accumulative Roll Bond Half Ring Lower Anvil Conventional Ingot Metallurgy
This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan, in Priority Areas “Giant Straining Process for Advanced Materials Containing Ultra-High Density Lattice Defects” and in part by Kyushu University Interdisciplinary Programs in Education and Projects in Research Development (P&P).
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