1. Center for Microelectronics and Nanotechnology, Institute of Materials Engineering, University of Rzeszów,al. Rejtana 16, 35-959 Rzeszów, Poland
2. International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
3. Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Faculty of Fundamental Problems ofTechnology, Wrocław University of Science and Technology, ul. Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland