Combinatorial fabrication and characterization of ferromagnetic Ti-Co-O system

M. Murakami, Y. Matsumoto, M. Nagano, T. Hasegawa, M. Kawasaki, H. Koinuma

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

TiO 2 -CoO binary compositional spread thin films were grown on a LaSrAlO 4 (0 0 1) (LASO) single crystal substrate at temperatures gradient from 550 to 750 °C. The ambient was fixed at an oxygen pressure between 5 × 10 -5 and 5 × 10 -7 Torr during the deposition. Scanning superconducting quantum interference device microscope was used as a high throughput screening of magnetic properties in the combinatorial libraries. X-ray diffraction (XRD) was used as structural characterization. From the XRD measurements, c-axis oriented anatase peaks were observed up to Co contents around 50%. Around this Co content, CoTiO 3 peaks have maximum intensity and CoO peak appeared at higher Co content. The film magnetization was increasing with decreasing of oxygen pressure at the deposition. The region, in which magnetic domain structure was observed, agrees well with film conductive region.

Original languageEnglish
Pages (from-to)245-248
Number of pages4
JournalApplied Surface Science
Volume223
Issue number1-3
DOIs
Publication statusPublished - 2004 Feb 15
Externally publishedYes

Keywords

  • Anatase
  • Combinatorial chemistry
  • DMS
  • Ferromagnetic
  • Laser MBE
  • Scanning SQUID

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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