Giant magnetoresistance of Cu3Al-Cu2MnAl melt-spun ribbons

S. Sugimoto, S. Kondo, H. Nakamura, D. Book, Y. Wang, T. Kagotani, R. Kainuma, K. Ishida, M. Okada, M. Homma

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20 Citations (Scopus)

Abstract

The giant magnetoresistance of Cu-Mn-Al melt-spun ribbons with compositions along the Cu3Al-Cu2MnAl tie line, was investigated. X-ray diffraction and TEM observations revealed that the as-spun ribbons have either an L21 or a D03 type structure. The Cu-15Mn-25Al ribbon exhibited the highest MR ratio of 1.1% (measured at room temperature) among the as-spun ribbons. Two phase decomposition into the Cu3Al and Cu2MnAl phases, occurs after heat treatment within the miscibility gap, and the coherent two phase microstructure grows with increasing heat treatment temperature. This results in an increase in the magnetization and the MR ratio of the ribbons. The Cu-10Mn-25Al ribbon showed the highest MR ratio of 3.9% (measured at room temperature), after a heat treatment at 423 K for 6 h. From the phase diagram, the volume fraction of Cu2MnAl phase in this ribbon is 35.7%, which corresponds to the optimum volume fraction of ferromagnetic phase reported in other granular type GMR materials. The high MR ratio region is narrow and closely related to the two phase decomposition area of Cu-Mn-Al.

Original languageEnglish
Pages (from-to)273-280
Number of pages8
JournalJournal of Alloys and Compounds
Volume265
Issue number1-2
DOIs
Publication statusPublished - 1998 Jan 30

Keywords

  • Giant magnetoresistance
  • Heusler
  • Melt-spinning
  • Two phase decomposition

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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