Affiliation: | aForschungszentrum Karlsruhe in der Helmholtzgesellschaft, Institut für Nanotechnologie, Postfach 3640, 76021 Karlsruhe, Germany bInstitute of Physics of Advanced Materials, Ufa State Aviation Technical University, K.Marks Str. 12, 450000 Ufa, Russia cDivision of Materials, Ulm University, Albert Einstein Allee 47, 89081 Ulm, Germany |