1. Faculty of Materials Engineering and Technical Physics, Poznan University of Technology, Piotrowo 3, Poznan 60-965, Poland
2. Institute of Low Temperature and Structure Research of Polish Academy of Sciences, Okólna 2, Wroclaw 50-422, Poland
3. Center for Advanced Technology, Adam Mickiewicz University, Uniwersytetu Poznańskiego 10, Poznan 61-614, Poland
4. Institute of Applied Physics, Military University of Technology, Kaliskiego 2, Warsaw 00-908, Poland
5. Institute of Chemistry, Military University of Technology, Kaliskiego 2, Warsaw 00-908, Poland