Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 3: Ultrafast Electron and spin dynamics at interfaces I
O 3.3: Talk
Monday, March 12, 2018, 11:00–11:15, MA 005
Femtosecond spin-dependent charge transfer at Co/Cu(001) interfaces — •Andrea Eschenlohr1, Jinghao Chen1, Tristan Müller2, Peter Elliott2, Eberhard K. U. Gross2, Uwe Bovensiepen1, and Sangeeta Sharma2 — 1Faculty of Physics, University of Duisburg-Essen — 2Theory Department, MPI for Microstructure Physics, Halle (Saale)
The elementary processes behind ultrafast spin transfer at epitaxial Co/Cu(001) interfaces due to optical excitation with 1.5 eV photon energy are disentangled by combining femtosecond time-resolved interface-sensitive magnetization-induced second harmonic generation and ab initio time-dependent density functional theory. We obtain a convincing agreement between the observables in theory and experiment, which allows us to directly identify spin-dependent charge transfer between Co and Cu active at < 30 fs, and spin-flips mediated by the spin-orbit interaction, which lead to a loss of spatially integrated spin polarization and dominate at > 30 fs. In particular, we find that the charge transfer from Cu into Co is also spin polarized.
We acknowledge funding from DFG through SPP 1840 QUTIF.