AVS 49th International Symposium
    Magnetic Interfaces and Nanostructures Friday Sessions
       Session MI+TF-FrM

Paper MI+TF-FrM10
Growth and Characterization of Ferromagnetic Fe-Doped Rutile TiO@sub 2@ Clusters and Thin Films

Friday, November 8, 2002, 11:20 am, Room C-205

Session: Magnetic Thin Films and Surfaces
Presenter: S. Thevuthasan, Pacific Northwest National Laboratory
Authors: S. Thevuthasan, Pacific Northwest National Laboratory
Y.J. Kim, Taejon National University of Technology
T. Droubay, Pacific Northwest National Laboratory
V. Shutthanandan, Pacific Northwest National Laboratory
A.S. Lea, Pacific Northwest National Laboratory
M.H. Engelhard, Pacific Northwest National Laboratory
S.A. Chambers, Pacific Northwest National Laboratory
J. Schneider, University of Connecticut
R. Sears, University of Connecticut
B. Sinkovic, University of Connecticut
Correspondent: Click to Email
There is a growing interest in searching for spin injection materials with high injection efficiencies and room temperature operations. Some of the dilute magnetic semiconductors with the potential for room temperature spintronics applications include Co-doped ZnO, Mn-doped GaN and Co-doped anatase TiO@sub 2@. Although there are still some issues associated with the growth of single crystal Co-doped anatase TiO@sub 2@, recent experiments show that this material is the most promising candidate because of its room temperature ferromagnetism.@footnote 1,2@ Recently, we have investigated the growth and characterization of Fe@sub x@Ti@sub 1-x@O@sub 2@ (x ~ 0.02-0.16) on single crystal TiO@sub 2@(110) at the Molecular Beam Epitaxy facility of the Environmental Molecular Sciences Laboratory (EMSL). Some of these films exhibit ferromagnetism at room temperature. The morphology of these films consist of the film proper along with Fe rich clusters containing a mixture of Fe@super 2+@ and Fe@super 3+@ valence states. These films were characterized using several surface science techniques including x-ray photoelectron spectroscopy (XPS) atomic force microscopy (AFM), scanning Auger microscopy (SAM), x-ray absorption spectroscopy (XAS), and Rutherford backscattering spectrometry (RBS)/channeling. These results with the magneto-optical Kerr effect (MOKE) measurements from these films will be discussed. @FootnoteText@ @footnote 1@ M. Matsumoto et al., Science, 291, (2001) 854. @footnote 2@ S.A. Chambers et al., Appl. Phys. Lett. 79 (2001) 3467. Work supported by the U.S. Department of Energy, Offices of Basic Energy Sciences and Biological and Environmental Research and the laboratory directed research and development (LDRD) program.