Spin-dependent trapping of electrons at spinterfaces

Sabine Steil, Nicolas Großmann, Martin Laux, Andreas Ruffing, Daniel Steil, Martin Wiesenmayer, Stefan Mathias, Oliver L A Monti Masel, Mirko Cinchetti, Martin Aeschlimann

Research output: Contribution to journalArticle

114 Citations (Scopus)

Abstract

Hybrid ferromagnetic metal/organic interfaces - also known as spinterfaces - can exhibit highly efficient spin-filtering properties and therefore present a promising class of materials for the future development of new spintronic devices. Advancing the field depends critically on elucidating the fundamental microscopic processes that eventually determine the spin-filtering properties in such hybrid structures. Here, we study the femtosecond spin dynamics at the prototypical interface between cobalt and the metalorganic complex tris(8-hydroxyquinolinato)aluminium. To disentangle the microscopic origin of spin filtering, we optically generate a transient spin polarization in a well-defined hybrid interface state that we follow with a spin-resolved real-time pump-probe two-photon photoemission experiment. We find that the electrons are trapped at the interface in a spin-dependent manner for a surprisingly long time of the order of 0.5-1 ps. We conclude that ferromagnetic metal/organic interfaces act as spin filters because electrons are trapped in hybrid interface states by spin-dependent confining potentials.

Original languageEnglish (US)
Pages (from-to)242-247
Number of pages6
JournalNature Physics
Volume9
Issue number4
DOIs
StatePublished - Apr 2013

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trapping
electrons
hybrid structures
spin dynamics
confining
metals
photoelectric emission
cobalt
pumps
aluminum
filters
probes
photons
polarization

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Steil, S., Großmann, N., Laux, M., Ruffing, A., Steil, D., Wiesenmayer, M., ... Aeschlimann, M. (2013). Spin-dependent trapping of electrons at spinterfaces. Nature Physics, 9(4), 242-247. https://doi.org/10.1038/nphys2548

Spin-dependent trapping of electrons at spinterfaces. / Steil, Sabine; Großmann, Nicolas; Laux, Martin; Ruffing, Andreas; Steil, Daniel; Wiesenmayer, Martin; Mathias, Stefan; Monti Masel, Oliver L A; Cinchetti, Mirko; Aeschlimann, Martin.

In: Nature Physics, Vol. 9, No. 4, 04.2013, p. 242-247.

Research output: Contribution to journalArticle

Steil, S, Großmann, N, Laux, M, Ruffing, A, Steil, D, Wiesenmayer, M, Mathias, S, Monti Masel, OLA, Cinchetti, M & Aeschlimann, M 2013, 'Spin-dependent trapping of electrons at spinterfaces', Nature Physics, vol. 9, no. 4, pp. 242-247. https://doi.org/10.1038/nphys2548
Steil S, Großmann N, Laux M, Ruffing A, Steil D, Wiesenmayer M et al. Spin-dependent trapping of electrons at spinterfaces. Nature Physics. 2013 Apr;9(4):242-247. https://doi.org/10.1038/nphys2548
Steil, Sabine ; Großmann, Nicolas ; Laux, Martin ; Ruffing, Andreas ; Steil, Daniel ; Wiesenmayer, Martin ; Mathias, Stefan ; Monti Masel, Oliver L A ; Cinchetti, Mirko ; Aeschlimann, Martin. / Spin-dependent trapping of electrons at spinterfaces. In: Nature Physics. 2013 ; Vol. 9, No. 4. pp. 242-247.
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