Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 38: Spintronics
O 38.7: Vortrag
Dienstag, 8. März 2016, 15:30–15:45, S051
Determining excitation pathways at the Cobalt/Alq3 interface — •Philip Thielen1,2, Anna-Katharina Mahro1, Benjamin Stadtmüller1, Mirko Cinchetti1, and Martin Aeschlimann1 — 1Fachbereich Physik and Research Center OPTIMAS, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany — 2Graduate School of Excellence Materials Science in Mainz, Gottlieb-Daimler-Str. 47, 67663 Kaiserslautern, Germany
One of the fundamental questions in molecular spintronics consists in understanding the properties of hybrid interfaces between molecules and ferromagnetic metals. Recently, it was shown that the interface state between a thin layer of the metalorganic complex tris(8-hydroxyquinolinato)aluminium (Alq3) and a cobalt surface acts as a spin filter due to the prolonged spin-dependent trapping of electrons [1]. The excitation of spin-polarized electrons into such hybrid interface states can take place either directly from the cobalt in a coherent process or in an indirect, incoherent process, e.g. via charge transfer. We show that we can disentangle coherent and incoherent excitation pathways using a phase-stabilized two-pulse correlation experiment. We discuss the possible implications of our findings regarding the optical control of spin-polarized electrons at hybrid interfaces.
References: [1] S. Steil, N. Großmann, M. Laux, A. Ruffing, D. Steil, M. Wiesenmayer, S. Mathias, O. L. A. Monti, M. Cinchetti and M. Aeschlimann, Nature Physics 9, 242 - 274 (2013)