1. Bielefeld University, Faculty of Physics, Universitätsstraße 25 1 , 33615 Bielefeld, Germany
2. Bielefeld University of Applied Sciences and Arts, Faculty of Engineering and Mathematics 2 , Interaktion 1, 33619 Bielefeld, Germany
3. Silesian University of Technology, Institute of Physics—Center for Science and Education 3 , 44-100 Gliwice, Poland
4. Helmholtz-Zentrum Berlin für Materialien und Energie 4 , Berlin 12489, Germany