Giant magnetoresistance and microstructure in Cr-Fe and Cu-Co heterogeneous alloys

K. Takanashi, J. Park, T. Sugawara, K. Hono, A. Goto, H. Yasuoka, H. Fujimori

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We have investigated the relationship between the giant magnetoresistance (GMR) and the microstructure in sputter-deposited Cu-Co heterogeneous alloy films. MR varies depending on Co concentration, x, and it shows a maximum around x=20 at.%Co. The transmission electron microscopy and nuclear magnetic resonance measurements reveal that the size of Co particles and the compositional profile near the interfaces of Co particles do not depend on x. The magnetization measurements suggest that the particle density increases with increasing x. When the particle density is too high, the ferromagnetic coupling between Co particles is dominant, resulting in a reduction in MR. The particle density for x ∼ 20 at.%Co is considered to be optimum for GMR.

Original languageEnglish
Pages (from-to)106-110
Number of pages5
JournalThin Solid Films
Volume275
Issue number1-2
DOIs
Publication statusPublished - 1996 Apr 1

Keywords

  • Alloys
  • Magnetic properties and measurements
  • Nuclear magnetic resonance
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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