Regensburg 2004 – wissenschaftliches Programm
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MA: Magnetismus
MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)
MA 13.4: Poster
Dienstag, 9. März 2004, 15:00–19:00, Bereich A
Structure and Electronic Properties of Fe3O4(100) and Fe3O4(111) Surfaces — •M. Fonin1, Yu. Dedkov1, D. Vyalikh2, M. Sperlich1, S. Molodtsov2, F. Matthes3, L. N. Tong3, C. M. Schneider3, U. Rüdiger4, and G. Güntherodt1 — 1II. Physikalisches Institut, Rheinisch-Westfälische Technische Hochschule Aachen, D-52056 Aachen, Germany — 2Institut für Festköperphysik, Technische Universität Dresden, D-01062 Dresden, Germany — 3Leibniz Institute for Solid State and Materials Research Dresden, PF 270116, D-01171 Dresden, Germany — 4Fachbereich Physik, Universität Konstanz, D-78457, Konstanz, Germany
Since years ferromagnetic transition-metal oxide (TMO) films have been a subject of intensive research due to possible applications in various fields of technology. Highly spin-polarized TMO films, among them magnetite (Fe3O4) are claimed to have a large potential for future applications in spin-electronic devices.
High-quality thin epitaxial Fe3O4(100) and Fe3O4(111) films were prepared by MBE and the crystalline surface structure of the films was studied by LEED and STM. The surface electronic structure of thin epitaxial Fe3O4 films has been investigated at room temperature by means of spin- and angle-resolved photoelectron spectroscopy. A maximum spin polarization value of about −(55±10)% was found near EF at room temperature for the Fe3O4(100) films on MgO(100) substrates. For epitaxial Fe3O4(111) films higher spin polarization values up to about −(80±5)% were observed near EF at room temperature.