Regensburg 2013 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 99: Transport: Spintronics and magnetotransport 2 (TT, jointly with HL, MA)
HL 99.2: Talk
Friday, March 15, 2013, 09:45–10:00, H20
Initial stages of epitaxial growth of Fe3O4/MgO (001) thin films: atomic reconstruction at the polar interface — •Chun-Fu Chang1, Zhiwei Hu1, Stefan Klein2, Ronny Sutarto2, Philipp Hansmann2, Arata Tanaka3, Julio Criginski Cesar4, Nicholas Brookes4, Hong-Ji Lin5, Hui-Huang Hsieh6, Chien-Te Chen5, A. Diana Rata1, and Liu Hao Tjeng1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2II. Physikalisches Institut, Universität zu Köln, Köln, Germany — 3Department of Quantum Matter, ADSM, Hiroshima University, Hiroshima, Japan — 4ESRF, Grenoble Cédex, France — 5NSRRC, Hsinchu, Taiwan — 6Chung Cheng Institute of Technology, National Defense University, Taoyuan, Taiwan
By means of reflection high energy electron diffraction and Fe L2,3 x-ray absorption spectroscopy we find evidence for an atomic structural reconstruction at the interface of polar Fe3O4/MgO (001) thin films. This reconstruction takes place over several monolayers, while each monolayer still preserves the Fe3O4 stoichiometery. Our findings for such a transition interface layer may have important implications especially in the field of spintronics, where ultrathin Fe3O4 films are widely used for various sensitive devices.