1. Department of Physics, Tokyo Metropolitan University, Hachioji, 192-0397, Japan
2. Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Nagoya 463-8560, Japan
3. Department of Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan
4. Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
5. Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai 980-8577, Japan
6. KOKUSAI ELCTRIC CORP., Toyama 939-2393, Japan
7. Department of Electronics, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
8. School of Materials Science, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
9. WPI Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kanazawa 920-1192, Japan