Magnetic properties and GMR in Fe-Cu granular films prepared by ionized cluster beam technique

Kimio Wakoh, Masanori Yosida, Toyohiko J. Konno, Takehiko Hihara, Kenji Sumiyama, Kenji Suzuki

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Fe cluster dispersed Fe-Cu granular films have been produced by an ionized cluster beam (ICB) technique. Magnetoresistance (MR) and magnetic properties were observed for Fe-Cu films produced at different acceleration voltages (Va=0 and 2.5 kV). The chemical composition of the films prepared at Va=2.5 kV is Fe-richer than the designed one, indicating the "resputtering" of Cu atoms from the deposited films. These films exhibit giant magnetoresistance (GMR), which does not saturate even at high fields: conduction-electrons suffer spin-disorder scattering With increasing Fe concentration, the MR values of these granular films monotonically decrease, whereas those of the sputtered and thermally evaporated films show maxima at around 25 at%Fe. The disappearance of the MR maximum is ascribed to the presence of antiferromagnetic Fe clusters. In addition, the MR values of the ICB-deposited films prepared at Va=2.5 kV are higher than those at Va=0 kV, indicating that the former is smaller in the average cluster size than the latter.

Original languageEnglish
Pages (from-to)502-506
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume61
Issue number6
DOIs
Publication statusPublished - 1997

Keywords

  • Acceleration voltage
  • Granular material
  • Ionized cluster beam
  • Iron-copper
  • Magnetoresistance

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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