1. Research Institute for Technical Physics and Materials Science, 1121 Budapest, Konkoly Thege M. út 29-33, Hungary
2. University of Pannonia, Faculty of Information Technology, 8200 Veszprém, Egyetem u. 10, Hungary
3. Advanced Electric Materials Center, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
4. Nanovation SARL, 103 bis Rue de Versailles, Orsay 91400, France
5. SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, U.K.