1. Laboratory for Advanced Materials, Faculty of Natural Sciences, Comenius University, Ilkovičova 8, 84104 Bratislava, Slovakia
2. Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, 84104 Bratislava, Slovakia
3. Centre for Nanodiagnostics of Materials, Faculty of Materials Science and Technology, Slovak University of Technology, Vazovova 5, 81243 Bratislava, Slovakia
4. Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 84511 Bratislava, Slovakia
5. Centre of Excellence for Advanced Materials Application, Dúbravská cesta 9, 84511 Bratislava, Slovakia