Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65
MA 20.26: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU C
Structure and Electronic Properties of the Fe3O4(100) Surface: Evidence of a Half-Metal to Metal Transition — •M. Fonin1,2, Yu. Dedkov3,2, R. Pentcheva4, M. Sperlich2, M. Scheffler5, U. Rüdiger1, and G. Güntherodt2 — 1Fachbereich Physik, Universität Konstanz, 78467 Konstanz, Germany — 2II. Physikalisches Institut, Rheinisch-Westfälische Technische Hochschule Aachen, 52056 Aachen, Germany — 3Institut für Festköperphysik, Technische Universität Dresden, 01062 Dresden, Germany — 4Dept. of Earth and Environmental Sciences, University of Munich, Theresienstr. 41, 80333 Munich, Germany — 5Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
Highly spin-polarized transition metal oxide films, among them magnetite (Fe3O4), are a subject of intensive research due to the possible future applications in spin-electronic devices.
In situ prepared Fe3O4(100) thin films were studied by means of scanning tunneling microscopy (STM) and spin-polarized photoelectron spectroscopy (SP-PES). The (√2×√2)R45 ∘ "wave-like" surface atomic structure observed by STM is in good agreement with the new structural model predicted by density functional theory (DFT) in the framework of ab initio thermodynamics. For the bulk oxide a spin polarization (SP) value of -100 % was predicted by LSDA calculations [1]. On the Fe3O4(100) surface both SP-PES and DFT results indicate a strong reduction of SP to about -55 % and a transition from half-metallic to metallic behavior.
[1] Z. Zhang and S. Satpathy, Phys. Rev. B 44, 13319 (1991).