Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Magnetic Oxides and Shape Memory Alloys (jointly with MM)
MA 35.6: Vortrag
Donnerstag, 14. März 2013, 10:45–11:00, H23
Designing magnetic functionality in spin filter oxides on silicon — •Christian Caspers1, Sebastian Flade1, Mihaela Gorgoi2, Andrei Gloskovski3, Wolfgang Drube3, Claus M. Schneider1, and Martina Müller1 — 1Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich — 2BESSY II, Helmholtz-Zentrum Berlin — 3DESY Photon Science, DESY Hamburg
Integrating the magnetic oxide functionality into spintronics devices is an appealing route for realizing highly efficient and conductance-matched spin filter contacts. Europium Oxide (EuO) is the only binary magnetic oxide (MO) predicted to be thermodynamically stable on silicon. We succeeded in integrating high-quality EuO thin films directly on Si(001). We performed a depth-sensitive hard x-ray photoemission (HAXPES) study to selectively probe the bulk EuO and EuO/Si interface electronic structure. A quantitative analysis of the Eu core-level photoemission spectra reveals a nearly ideal stoichoimetry of ultra-thin EuO/Si(001) films (d=4 nm) and a fully homogeneous cation distribution. A careful inspection of the Si2p core level provides insights into the chemical state of the EuO/Si interface. An in situ passivation of SiO2 in the monolayer regime reduces metallic silicides at the EuO/Si interface to less than 3 A. Moreover, an epitaxial growth is realized in these carefully designed MO/Si heterostructures. Our study demonstrates the successful integration of high-quality EuO thin films directly on silicon, paving the way for future spin injection applications.