D.G. Kovtun - Ph. D. (Phys.-Math.), Associate Professor, Department «Physics», Volgograd State Technical University E-mail: kdmob74@gmail.com S.A. Alikov - Post-graduate Student, Department «Physics», Volgograd State Technical University E-mail: sputnik_as@mail.ru A.G. Shein - Dr. Sc. (Phys.-Math.), Professor, Department «Physics», Volgograd State Technical University E-mail: professor39@mail.ru D.L. Yeskin - Ph. D. (Phys.-Math.), Associate Professor, Volgograd Academy of Internal Affairs Ministry of RF E-mail: yd38@bk.ru

Ch.Z. Nguyen¹, S.A. Alikov²,  A.G. Shein³, D.G. Kovtun4, E.M. Ilyin5

1-4 Volgograd State Technical University (Volgograd, Russia)

5 Moscow State Technical University. N.E. Bauman (Moscow, Russia)

M.V. Davidovich – Dr.Sc.(Phys.-Math.), Professor,

Department of Radiotechnique and Electrodynamics, 

Saratov National Research State University named after N. G. Chernyshevsky

E-mail: davidovichmv@info.sgu.ru 

A.K. Kobets – Post-graduate Student, 

Department of Solid State Physics, Saratov National Research State University named after N. G. Chernyshevsky E-mail: cobets.alexander@yandex.ru

Ch.-Z. Nguyen1, D.G. Kovtun2

1,2 Volgograd State Technical University (Volgograd, Russia)

Chong-Zu Nguyen1, D.G. Kovtun2

1,2 Volgograd State Technical University (Volgograd, Russia)

2 kdmob74@gmail.com