1. Center of Materials and Nanotechnologies, Faculty of Chemical Technology University of Pardubice, Nam. Cs. Legii 565, 530 02 Pardubice, Czech Republic
2. Central European Institute of Technology Brno University of Technology, Purkynova 123, 612 00 Brno, Czech Republic
3. Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland