Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 44: Joint Session "Spins in Organic Materials" (jointly with DS)

MA 44.3: Vortrag

Donnerstag, 29. März 2012, 17:15–17:30, H 1012

Spin-filtering at hybrid organic-inorganic interfaces — •Sabine Steil, Nicolas Großmann, Norman Haag, Mirko Cinchetti, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany.

Organic semiconductors have demonstrated their potential as a new class of materials for spintronics applications [1]. They are expected to constitute a new building block for advanced spintronics devices. One of their most intriguing properties is that they form hybrid interfaces with ferromagnetic metals [2]. As an example, we have recently shown that the spin-injection efficiency at the cobalt-copper phthalocyanine interface can be tailored by electron doping [3]. Here, we will show our recent experiments on the interface between cobalt(001) and tris(8-hydroxyquinoline)aluminium(III) (Alq3). Interface formation was studied by means of spin-resolved ultraviolet photoemission spectroscopy, while the spin- and time-resolved two-photon photoemission spectroscopy was used to measure the spin-dependent lifetime of hot charge carriers excited in an unoccupied hybrid interface state. The magnitude of the lifetime, gives information about the degree of hybridization of the considered state. More importantly, we found that the lifetime in such state is spin-dependent, providing direct evidence that hybrid organic-inorganic interfaces can be employed as a novel kind of spin-filter.

[1] V. A. Dediu, et al., Nat. Mater. 8, 707(2009) [2] S. Sanvito, Nat. Phys. 6, 562-564(2010) [3] M. Cinchetti et al., PRL 104, 217602(2010)