Speed and efficiency of femtosecond spin current injection into a nonmagnetic material

M. Hofherr, P. Maldonado, O. Schmitt, M. Berritta, U. Bierbrauer, S. Sadashivaiah, A.J.M. Schellekens, B. Koopmans, D. Steil, M. Cinchetti, B. Stadtmüller, P.M. Oppeneer, S. Mathias, M. Aeschlimann

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Abstract

We investigate femtosecond spin injection from an optically excited Ni top layer into an Au bottom layer using time-resolved complex magneto-optical Kerr effect (C-MOKE) measurements. Employing the C-MOKE formalism, we are able to follow layer-resolved demagnetization in Ni and the simultaneous spin injection into the adjacent Au film, both occurring within ∼40fs. We confirm the ballistic to diffusive propagation of the spin transfer process with ab initio theory and superdiffusive transport calculations. In particular, our combined experimental-theoretical effort does allow us to quantify the so far elusive amount of spin injection, and therefore the spin injection efficiency at the interface.

Original languageEnglish
Article number100403
Pages (from-to)1-6
JournalPhysical Review B
Volume96
Issue number10
DOIs
Publication statusPublished - 14 Sep 2017

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