Intrinsic Ferromagnetism in Insulating Cobalt Doped Anatase TiO2

K. A. Griffin, A. B. Pakhomov, C. M. Wang, S. M. Heald, and Kannan M. Krishnan
Phys. Rev. Lett. 94, 157204 – Published 22 April 2005

Abstract

Using complementary experiments we show that the room temperature ferromagnetism observed in anatase CoTiO2 films is not carrier mediated, but coexists with the dielectric state. TEM and x-ray absorption spectroscopy reveal a solid solution of Co in anatase, where Co is not metallic but in the +2 state substituting for Ti. Measurements at 300 K yield a MS of 1.1μB/Co atom, while all films are highly insulating. The evidence of intrinsic ferromagnetism in the dielectric ground state of CoTiO2 leads to new considerations for the origin of ferromagnetism in transition metal doped oxides.

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  • Received 20 August 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.157204

©2005 American Physical Society

Authors & Affiliations

K. A. Griffin1, A. B. Pakhomov1, C. M. Wang2, S. M. Heald2, and Kannan M. Krishnan1,*

  • 1Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, USA
  • 2Fundamental Science Division, Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, USA

  • *Author to whom correspondence should be addressed. Email: kannanmk@u.washington.edu

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Vol. 94, Iss. 15 — 22 April 2005

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