1Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany
2Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
3Spin Optics Laboratory, St. Petersburg State University, 199034 St. Petersburg, Russia
4Centre for Micro and Nano Devices, Department of Physics, COMSATS University, 44000 Islamabad, Pakistan
5Laboratory of Inorganic Chemistry, Department of Chemistry and Applied Biosciences, ETH Zürich, CH-8093 Zürich, Switzerland
6Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
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