1. Institute of Physics, National Academy of Sciences, 46 Nauki Ave., Kyiv, 03039, Ukraine
2. Institute of Magnetism, National Academy of Sciences ofUkraine, 36-b Academician Vernadsky Blvd., Kyiv, 03142, Ukraine
3. Taras Shevchenko National University of Kyiv Bldg. 5, 2 Glushkova Ave., Kyiv, 03127, Ukraine