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Dresden 2006 – scientific programme

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MA: Magnetismus

MA 24: Magnetic Thin Films III

MA 24.6: Talk

Thursday, March 30, 2006, 11:30–11:45, HSZ 03

Fe-doped MgO thin films in the impurity limit — •R. Sutarto1, T. Haupricht1, H. Ott1, M. W. Haverkort1, A. Tanaka2, H. -H. Hsieh3, H. -J. Lin4, C. T. Chen4, and L. H. Tjeng11II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany — 2Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan — 3Chung Cheng Institute of Technology, National Defense University, Taoyuan 335, Taiwan — 4National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu 30077, Taiwan

Epitaxial Fe-doped MgO thin films at different doping levels from 1% to 30% have been successfully grown using Molecular Beam Epitaxy (MBE). Fe L2,3 x-ray absorption spectra (XAS) of Fe-doped MgO at 1-2% Fe doping levels shows a striking narrow peak indicating that non-local effects of inter-Fe-site fluctuations are strongly suppressed. The experimental results in this impurity limit are well reproduced using FeO6 cluster calculations with Oh symmetry, implying that the film is an excellent reference sample for a d6 high spin state system. Moreover, this cluster model simulates well the observed temperature dependence of the XAS spectra caused by thermal population of the spin-orbit split initial states.

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