A.M. Bobreshov, A.V. Ivantsov, I.S. Korovchenko, V.A. Stepkin, G.K. Uskov

N.Yu. Karpechenko, V.K. Gasanova, N.V. Ryadninskaya, E.A. Lesovaya, K.I. Kirsanov, G.A. Belitsky, M.G. Yakubovskaya

D.A. Usanov - Dr.Sc. (Phys.-Math.), Professor, Head of the Department "Solid State Physics", Saratov State University named after N.G. Chernyshevskii. E mail: UsanovDA@info.sgu.ru
S.S. Gorbatov - Dr.Sc. (Phys.-Math.), Professor, Department "Solid State Physics", Saratov State University named after N.G. Chernyshevskii. E-mail: Gorba@yandex.ru
A.V. Fadeev - Post-graduate Student, Saratov State University named after N.G. Chernyshevskii. E-mail: Fadey24@mail.ru

V.G. Tikhomirov – Ph.D. (Eng.), Associate Professor, Saint-Petersburg Electrotechnical University “LETI”

E-mail: vv11111@yandex.ru

M.K. Popov – Student, Saint-Petersburg Electrotechnical University “LETI”

E-mail:mat68rus@mail.ru

G.A. Gudkov – Laboratorian, Hyperion Ltd. (Moscow)

E-mail: ooo.giperion@gmail.com

V.G. Tikhomirov1, G.A. Gudkov2, S.V. Agasieva3

1 St. Petersburg State Electrotechnical University «LETI» (Saint-Petersburg, Russia)
2 HYPERION Ltd. (Moscow, Russia)
3 Peoples’ Friendship University of Russia (Moscow, Russia)
1 greenbob53@gmail.com, 3 agasieva-sv@rudn.ru

T.T. Magkoev1, D.G. Mustafaeva2

1 North Ossetian State University (Vladikavkaz, Russia)

2 North Caucasus Mining and Metallurgical Institute (State Technological University) (Vladikavkaz, Russia)

1 t_magkoev@mail.ru, 2 dzhamilya79@yandex.ru