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    Title: Electronic structure and magnetic properties of Al-doped Fe3O4 films studied by x-ray absorption and magnetic circular dichroism
    Authors: Yang, C. K.;Chiou, J. W.;Tsai, H. M.;Pao, C. W.;Jan, J. C.;Ray, S. C.;Yeh, C. L.;Huang, K. C.;Hsueh, H. C.;Pong, W. F.;Tsai, M.-H.;Hsieh, H. H.;Lin, H. J.;Hou, T. Y.;Hsu, J. H.
    Contributors: 淡江大學物理學系
    Keywords: iron compounds;aluminium;magnetic thin films;ferromagnetic materials;magnetic moments;valence bands;impurity distribution;doping profiles;XANES;impurity states;magnetic circular dichroism;exchange interactions (electron)
    Date: 2005-02
    Issue Date: 2013-05-31 11:32:32 (UTC+8)
    Publisher: College Park: American Institute of Physics
    Abstract: The electronic structure and magnetic properties of Al-doped Fe3O4 films at various Al concentrations were investigated by Al and O K-edge x-ray absorption near-edge structure (XANES) and Fe L3,2-edge magnetic circular dichroism (MCD) measurements. The O K-edge XANES spectra reveal that the intensity of O 2p–Fe 3d hybridized states decreases linearly as the Al concentration increases, suggesting that nonmagnetic Al substitution reduces couplings of the O 2p with Fe 3d orbitals. The Fe L3-edge MCD spectra show that the intensities of MCD features decrease as the Al concentration increases, which suggests that Al substitution reduces the magnetic moments of Fe ions. The Fe L3,2 XANES spectra suggest the absence of mixed valence states in agreement with previous x-ray resonance scattering measurements.
    Relation: Applied Physics Letters 86(6), pp.062504(3pages)
    DOI: 10.1063/1.1863450
    Appears in Collections:[物理學系暨研究所] 期刊論文

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