1. Institute of Natural Sciences, Ural Federal University, 51 Lenin Ave., Ekaterinburg 620000, Russia
2. The Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
3. Institute for Functional Imaging of Materials, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
4. Physics Department and CICECO-Aveiro Institute of Materials, University of Aveiro, 3810-193, Aveiro, Portugal