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HL: Fachverband Halbleiterphysik

HL 101: Transport: Nanoelectronics II - Spintronics and Magnetotransport (jointly with TT, MA)

HL 101.2: Vortrag

Freitag, 30. März 2012, 09:45–10:00, BH 243

Electronic transport through EuO spin filter tunnel junctions — •Nuttachai Jutong¹, Ivan Rungger², Stefano Sanvito², Udo Schwingenschlögl³, and Ulrich Eckern¹ — ¹Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany — ²School of Physics and CRANN, Trinity College Dublin, Dublin, Ireland — ³KAUST, PSE Division, Thuwal 23955-6900, Kingdom of Saudi Arabia

Spin filter tunnel junctions based on europium monoxide (EuO), a ferromagnetic semiconductor, are investigated by means of density functional theory. In particular, the spin transport of Cu/EuO/Cu junctions is investigated by using the self-consistent ab-initio electron transport code SMEAGOL. The dependence of the transmission coefficient on the interface spacing and on the EuO thickness is studied, and explained in terms of the density of states and the complex band structure of EuO. Our calculation indicates that EuO epitaxially grown on Cu can act as a perfect spin filter, with polarization close to 100%, which is related mainly to the Eu-4f states. The transmission coefficient is sensitive to the interface spacing, since this spacing determines the charge transfer between EuO and the Cu leads.