Bulk and surface magnetization of Co atoms in rutile Ti 1-xCoxO2-δ thin films revealed by x-ray magnetic circular dichroism

V. R. Singh, Y. Sakamoto, T. Kataoka, M. Kobayashi, Y. Yamazaki, A. Fujimori, F. H. Chang, D. J. Huang, H. J. Lin, C. T. Chen, H. Toyosaki, T. Fukumura, M. Kawasaki

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13 Citations (Scopus)

Abstract

We have studied magnetism in Ti1 - xCoxO 2 - δ thin films with various x and δ by soft x-ray magnetic circular dichroism (XMCD) measurements at the Co L2, 3 absorption edges. The estimated ferromagnetic moment by XMCD was 0.15-0.24μB/Co at the surface, while in the bulk it was 0.82-2.25μB/Co, which is in the same range as the saturation magnetization of 1.0-1.5μB/Co. These results suggest an intrinsic origin of the ferromagnetism. The smaller moment of the Co atom at the surface is an indication of a magnetically dead layer of a few nanometers thick at the surface of the thin films.

Original languageEnglish
Article number176001
JournalJournal of Physics Condensed Matter
Volume23
Issue number17
DOIs
Publication statusPublished - 2011 May 4

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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