High throughput characterization of magnetic semiconductor thin films with a scanning SQUID microscope

X. J. Fan, M. Murakami, R. Takahasi, T. Koida, Y. Matsumoto, T. Hasegawa, T. Fukumura, M. Kawasaki, P. Ahmet, T. Chikyow, H. Koinuma

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Magnetic properties of Co-doped rutile (Ti1-xCoxO2) film in combinatorial composition-spread form have been surveyed by means of a Scanning Superconducting-quantum-interference-device Microscope (SSM). As a consequence, we found magnetic domains in the spatial regions with x>0.05 without external field, giving strong evidence for ferromagnetism with finite spontaneous magnetization. The magnetic moment was monotonously increased with increasing doping level x from 0.05 to ∼ 0.13. On the other hand, it was almost unchanged for x > ∼ 0.13, suggesting that Co does not dissolve into rutile film beyond x ∼ 0.13. The SSM results on the rutile Ti0.95Co0.05O2 thin films with different thickness showed that the magnetic moment is proportional to film thickness, leading to a conclusion that the presently observed ferromagnetism does not result from Co or Co-based oxide particles on the film surface.

Original languageEnglish
Pages (from-to)55-60
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume700
Publication statusPublished - 2002 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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