Defect-mediated ferromagnetism in insulating Co-doped anatase TiO2 thin films
نویسندگان
چکیده
K. Griffin Roberts,1 M. Varela,2 S. Rashkeev,3,2,* S. T. Pantelides,3,2 S. J. Pennycook,2,3 and Kannan M. Krishnan1,† 1Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195, USA 2Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA Received 2 June 2008; published 7 July 2008
منابع مشابه
Intrinsic ferromagnetism in insulating cobalt doped anatase TiO2.
Using complementary experiments we show that the room temperature ferromagnetism observed in anatase Co:TiO(2) 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 M(S) of 1.1 mu(B)/Co atom, while all fi...
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