1. Device Technology Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 5, Higashi 1-1-1 Tsukuba 305-8565 Japan
2. Department of Electronics and Electrical Engineering, Faculty of Science and Technology Keio University 3-14-1 Hiyoshi, Kohoku-ku Yokohama 223-8522 Japan
3. Department of Physical Electronics, Faculty of Physics Herzen State Pedagogical University of Russia 48 Moika Embankment St Petersburg 191186 Russia
4. Transmission Electron Microscopy Station National Institute for Materials Science (NIMS) Sengen 1-2-1 Tsukuba 305-0047 Japan