1. Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL 02 668 Warsaw, Poland
2. Department of Physics and Electrical Engineering, Linnaeus University, 391 82 Kalmar, Sweden
3. International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL 02 668 Warsaw, Poland