1. Department of Materials Engineering, Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36D, 20-618 Lublin, Poland
2. Department of Applied Physics, Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36D, 20-618 Lublin, Poland
3. Institute of Physics, Maria Curie Sklodowska University in Lublin, Pl. M. Curie-Sklodowskiej 1, 20-031 Lublin, Poland