Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.54: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Growth, ferromagnetism and electronic properties of the magnetic oxide EuO on conductive SrTiO3 — •Patrick Lömker1, Bernardus Ziljstra1, Christian Caspers1, Michael Hoppe1, Andrei Glosovskij2, Wolfgang Drube2, Claus M. Schneider1,3, and Martina Müller1,3 — 1Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich — 2Petra III, DESY, Hamburg — 3Fakultät für Physik, Universität Duisburg-Essen
The spin-filter tunnelling effect, which occurs in magnetic insulators like EuO, is an efficient route to generate highly spin-polarized electron currents for spintronic applications. However, only theoretical studies exist for single-crystalline magnetic oxide tunnel barriers, in which band-structure dependent properties are taken into account.
In this regard, we propose a model system based on EuO epitaxially stabilized on Nb-doped SrTiO3(001) (Nb-STO). We succeeded to grow epitaxial ultrathin films (d=1−15 nm) of stoichiometric EuO on Nb-STO(001) using oxide molecular beam epitaxy. The structural properties have been analysed by in situ RHEED and LEED, showing a single crystalline growth mode. SQUID measurements display bulk-like ferromagnetic properties (TC= 69 K) for d>4 nm, whereas a reduction of TC is observed for d<4 nm. Hard X-ray photoelectron spectroscopy experiments reveal the chemical properties and homogeneity of the EuO/Nb-STO heterostructures.
Finally, transport measurements are envisioned to reveal spin filtering in fully epitaxial Euo/STO tunnel junctions.