1. Centre for Physics and Technological Research (CeFITec), Dept. de Física da Faculdade de Ciências e Tecnologia (FCT); Universidade Nova de Lisboa; 2829-516 Caparica Portugal
2. Ryazan State Radio Engineering University; Gagarin Str. 59/1 390005 Ryazan Russian Federation
3. Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and Hubei Key Laboratory of Nuclear Solid Physics, School of Physics and Technology; Wuhan University; 430072 Wuhan China
4. Institute for Physics of Microstructures of the Russian Academy of Sciences (IPM RAS); 603950 Nizhniy Novgorod Russian Federation
5. Faculty of Physics; Lomonosov Moscow State University; Leninskie Gory 119991 Moscow Russian Federation
6. Raith GmbH; Konrad-Adenauer-Allee 8 44263 Dortmund Germany