1. Institute of Electrical Engineering, Slovak Academy of Sciences, Dubravska cesta 9, SK-841-04 Bratislava, Slovakia
2. Faculty of Physics, Adam Mickiewicz University in Poznan, Institute of Spintronics and Quantum Information, ul. Uniwersytetu Poznańskiego 2, Poznan PL-61–614, Poland
3. Saratov State University, Astrakhanskaya Street 83, Saratov 410012, Russian Federation
4. Centre For Advanced Materials Application CEMEA, Slovak Academy of Sciences, Dubravska cesta 9, 845 11 Bratislava, Slovakia