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Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.54: Poster

Friday, April 4, 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 Müller1,31Peter-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.

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