Magneto-optical spectroscopy of diluted magnetic oxides TiO2−δ: Co

We report an experimental study on transversal Kerr effect (TKE) in magnetic oxide semiconductors TiO2-delta:Co. The TiO2-delta: Co thin films were deposited on LaAlO3 (0 0 1) substrates by magnetron sputtering in the argon-oxygen atmosphere at oxygen partial pressure of 2X10-6-2X10-4 Torr. It was o...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2009-04, Vol.321 (7), p.723-725
Main Authors: Gan'shina, E.A., Granovsky, A.B., Orlov, A.F., Perov, N.S., Vashuk, M.V.
Format: Article
Language:English
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Summary:We report an experimental study on transversal Kerr effect (TKE) in magnetic oxide semiconductors TiO2-delta:Co. The TiO2-delta: Co thin films were deposited on LaAlO3 (0 0 1) substrates by magnetron sputtering in the argon-oxygen atmosphere at oxygen partial pressure of 2X10-6-2X10-4 Torr. It was obtained that TKE spectra in ferromagnetic samples are extremely sensitive to the Co-volume fraction, the crystalline structure, and technology parameters. The observed well-pronounced peaks in TKE spectra for anatase Co-doped TiO2-delta films at low Co ( < 1%) volume fraction are not representative for bulk Co or Co clusters in TiO2-delta matrix that indicates on intrinsic ferromagnetism in these samples. With increase of Co-volume fraction up to 5-8% the fine structure of TKE spectra disappears and magneto-optical response in reflection mode becomes larger than that for thick Co films.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2008.11.035