Dynamic spin filtering at the Co/Alq<inf>3</inf> interface mediated by weakly coupled second layer molecules
Citation:
Droghetti A, Thielen P, Rungger I, Haag N, Groà mann N, Stöckl J, Stadtmÿller B, Aeschlimann M, Sanvito S, Cinchetti M, Dynamic spin filtering at the Co/Alq<inf>3</inf> interface mediated by weakly coupled second layer molecules, Nature Communications, 7, 2016, 12668-Download Item:

Abstract:
Spin filtering at organic-metal interfaces is often determined by the details of the interaction between the organic molecules and the inorganic magnets used as electrodes. Here we demonstrate a spin-filtering mechanism based on the dynamical spin relaxation of the long-living interface states formed by the magnet and weakly physisorbed molecules. We investigate the case of Alq3 on Co and, by combining two-photon photoemission experiments with electronic structure theory, show that the observed long-time spin-dependent electron dynamics is driven by molecules in the second organic layer. The interface states formed by physisorbed molecules are not spin-split, but acquire a spin-dependent lifetime, that is the result of dynamical spin-relaxation driven by the interaction with the Co substrate. Such spin-filtering mechanism has an important role in the injection of spin-polarized carriers across the interface and their successive hopping diffusion into successive molecular layers of molecular spintronics devices.
Sponsor
Grant Number
European Union Framework Programme 7 (FP7)
618082 ACMOL.
Author's Homepage:
http://people.tcd.ie/sanvitos
Author: SANVITO, STEFANO
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Journal ArticleCollections:
Series/Report no:
Nature Communications7
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Full text availableDOI:
http://dx.doi.org/10.1038/ncomms12668Licences: