E.V. Mitrofanov - Post-graduate Student, Graduate Research Scientist, Kotel\'nikov Institute of Radioengineering and Electronics of RAS. E-mail: mitrofanov_ireran@mail.ru V.A. Vdovin - Ph. D. (Phys.-Math.), Leading Research Scientist, Kotel\'nikov Institute of Radioengineering and Electronics of RAS. E-mail: vdv@cplire.ru V.V. Kulagin - Ph. D. (Phys.-Math.), Senior Research Scientist, Kotel\'nikov Institute of Radioengineering and Electronics of RAS. E-mail: victorvkulagin@yandex.ru V.A. Cherepenin - Dr. Sc. (Phys.-Math.), Professor, Corresponding Memeber of RAS, Deputy Director of Kotel\'nikov Institute of Radioengineering and Electronics of RAS. E-mail: cher@cplire.ru

V.P. Butukhanov1, E.B. Atutov2, O.N. Ochirov3

1-3 Institute of Physical Materials Science SB RAS (Ulan-Ude, Russia)

1 vbut1951@gmail.com; 2 evgeniy_atutov@mail.ru; 3 1_2_z@mail.ru