[1] TU Ilmenau, Inst Micro & Nanotechnol MacroNano, Inst Mat Sci & Engn, Chair Mat Elect Engn & Elect, Gustav Kirchhoff Str 5, D-98693 Ilmenau, Germany
[2] Palacky Univ Olomouc, Fac Sci, Dept Expt Phys, 17 Listopadu 12, Olomouc, Czech Republic
[3] Univ Iceland, Sci Inst, Dunhaga 3, IS-107 Reykjavik, Iceland