1. Institute of Magnetism of NAS of Ukraine and MES of Ukraine, 36-b Akad. Vernadsky blvd., Kyiv 03142, Ukraine
2. Nanostructure Physics, Royal Institute of Technology, Stockholm 10691, Sweden
3. Institute for Sorption and Problems of Endoecology of NAS of Ukraine, 13 Naumov str., Kyiv 03164, Ukraine