Tuning laser-induced terahertz spin currents from torque- to conduction-electron-mediated transport

1. Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany 2. Department of Physical Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany 3. Instituto de Nanociencia de Aragón (INA), Universidad de Zaragoza, Mariano Esquillor, Edificio I+D, 50018 Zaragoza, Spain 4. Departamento Física de la Materia Condensada, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain 5. Instituto de Ciencia de Materiales de Aragón (ICMA). Universidad de Zaragoza CSIC, 50009 Zaragoza, Spain. 6. Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 12116 Prague, Czech Republic 7. Institut für Physik, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany 8. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100190, China 9. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China 10. Shanghai Key Lab of Modern Optical Systems, University of Shanghai for Science and Technology, Shanghai 200093, China 11. Department of Physics, Shanghai University, Shanghai 200444, China 12. Department of Physics and National Laboratory of Solid State Microstructures, Nanjing University, 210093, China