1. Belarussian State University, Nezavisimosti ave. 4, 220030 Minsk, Belarus
2. Scientific and Practical Materials Research Center, National Academy of Sciences of Belarus, P. Brovki Str. 17, 220072 Minsk, Belarus
3. Institute of Physics, Maria Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland