1. Institute of Physics Kazimierz Wielki University in Bydgoszcz Powstańców Wielkopolskich str., 2 85090 Bydgoszcz Poland
2. Mechantronic Department Kazimierz Wielki University in Bydgoszcz Kopernik str., 1 85-074 Bydgoszcz Poland
3. Institute for Single Crystals National Academy of Sciences of Ukraine av. Nauki 60 61178 Kharkiv Ukraine