1. Institute of Magnetism, Kyiv 03142, Ukraine
2. Taras Shevchenko National University, Kyiv 01601, Ukraine
3. National University of Science and Technology ‘MISiS’, Moscow 119049, Russia
4. BCMaterials and University of Basque Country, UPV/EHU, Bilbao 48080, Spain
5. Ikerbasque, Basque Foundation for Science, Bilbao 48013, Spain