Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 24: Magnetic Heuslers, Half-Metals and Oxides II (organized by MA)
TT 24.5: Vortrag
Montag, 31. März 2014, 16:30–16:45, BEY 118
Exploring spin-filter tunneling in single-crystalline magnetic oxide heterostructures — •Bernardus Zijlstra1, Patrick Lömker1, Christian Caspers1, Michael Hoppe1, Jürgen Schubert2, Willi Zander2, Mihaela Gorgoi3, Claus M. Schneider1, and Martina Müller1 — 1Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich — 2Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich — 3BESSY II, Helmholtz-Zentrum Berlin
Magnetic insulators, like Europium Oxide (EuO) are of tremendous interest for spintronic research, since they can generate highly spin-polarized currents. In contrast to conventional tunneling, spin-filter tunneling through single-crystalline magnetic insulator barriers is not yet fully understood.
In order to realize fully epitaxial magnetic oxide tunnel barriers, ultrathin EuO films were grown directly on conductive Sn-doped In2O3 (001) (ITO), Nb-doped SrTiO3 (001) (STO) and As-doped Si (001).
The EuO heteroepitaxy was characterized by LEED, RHEED and XRD, whereas the magnetic and chemical properties were analyzed by SQUID and hard x-ray photoelectron spectroscopy. We find EuO/Si(001) and EuO/STO(001) to be epitaxial, stoichiometric and to display bulk-like magnetic properties, however, EuO/ITO(001) is strongly affected by oxygen diffusion at elevated TS. Electrical transport experiments reveal the respective spin filter tunneling properties.