1. Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland
2. Faculty of Chemistry, Biological and Chemical Research Centre UW, Żwirki i Wigury 101, PL-02689 Warsaw, Poland
3. International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences, Aleja Lotnikow 32/46, PL-02668 Warsaw, Poland