Phys. Rev. B Phys. Rev. B Transition of laser-induced terahertz spin currents from torque- to conduction-electron-mediated transport Jiménez-Cavero Pilar Universidad de Zaragoza Gueckstock Oliver Nádvorník Lukas Lucas Irene Universidad de Zaragoza Seifert Tom S. Wolf Martin Rouzegar Reza Brouwer Piet W. Becker Sven Jakob Gerhard Kläui Mathias Guo Chenyang Wan Caihua Han Xiufeng Jin Zuanming Zhao Hui Wu Di Morellón Luis Universidad de Zaragoza Kampfrath Tobias 2022 research-article