1. National Research Centre “ Kurchatov Institute”, 123182 Moscow, Russia
2. Moscow Institute of Physics and Technology (State University), 141700 Dolgoprudny, Moscow Region, Russia
3. CNR-IMEM (National Research Council, Institute of Materials for Electronics and Magnetism) and University of Parma, Viale Usberti 7A, 42124 Parma, Italy
4. Physics Department, Lomonosov Moscow State University, GSP-1, Leninskie Gory, 119991 Moscow, Russia
5. Physics Department, Saint Petersburg State University, Saint Petersburg 199034, Russia