1. Palacky University Regional Centre of Advanced Technologies and Materials Czech Advanced Technology and Research Institute Slechtitelu 27 783 71 Olomouc Czech Republic
2. Biology Centre, ISB, CAS Department of Nanobiotechnology Na Sadkach 7 370 05 Ceske Budejovice Czech Republic
3. Institute of Experimental Physics, SAS Department of Magnetism Watsonova 47 040 01 Kosice Slovakia