1. Institute of magnetism of NASU and MESU, Vernadsky blvd., 03680 Kyiv, Ukraine
2. Institute of Radio Engineering and Electronics, Russian Academy of Sciences, ul. Mokhovaya 11, Build.7, 125009 Moscow, Russia
3. Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, An der Universität 2, D–30823 Garbsen, Germany
4. National University of Science and Technology “MISIS,” Leninskiy prospekt 4, MISiS, Moscow 119049, Russia