1. Department of Mechanical and Aerospace Engineering, University of California Los Angeles, Los Angeles, California 90095, USA
2. Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany
3. Graduate School of Excellence Materials Science in Mainz (MAINZ), Staudingerweg 9, 55128 Mainz, Germany
4. Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
5. Institute of Physics ASCR, v.v.i., Cukrovarnicka 10, 162 53 Praha 6, Czech Republic
6. Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway