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

Kenichiro Suehiro, Shunichi Nishimura, Zenji Horita, Seiji Mitani, Koki Takanashi, Hiroyasu Fujimori

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)7349-7353
Number of pages5
JournalJournal of Materials Science
Issue number23-24
Publication statusPublished - 2008 Dec

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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