1. Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, UK.
2. Department of Physics, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan.
3. Research Center for Quantum Nano-Spin Sciences, 744 Motooka, Fukuoka 819-0395, Japan.
4. Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russia.
5. Kotelnikov Institute of Radio-engineering and Electronics RAS, Moscow 125009, Russia.
6. Institute for Physics of Microstructures, Russian Academy of Sciences, GSP-105, Nizhny Novgorod 603950, Russia.
7. The Blackett Laboratory, Imperial College London SW7 2AZ, UK.
8. London Centre for Nanotechnology and Department of Electronic and Electrical Engineering at University College London, London WC1H 01H, UK.
9. University Bordeaux, LOMA UMR-CNRS 5798,, F-33405 Talence Cedex, France.
10. Sechenov First Moscow State Medical University, Moscow 119991, Russia.