1. Fundamental Research Laboratories, NEC Corporation, 34 Miyukigaoka, Tsukuba 305–8501, Japan
2. Department of Materials Science and Engineering, Kyushu Institute of Technology, 1–1, Sensui–cho, Tobata–ku, Kita–Kyushu 804–8550, Japan
3. Institute of Advanced Material Study, Kyushu University, 6–1, Kasuga Koen, Kasuga 816–8580, Japan
4. Frontier Technology Division, Electrotechnical Laboratory, AIST, MITI, 1–4 Umezono 1–chome, Tsukuba 305–8568, Japan
5. Space Experiment Department, National Space Development Agency of Japan, 1–1 Sengen 2–, Tsukuba 305–8505, Japan
6. Frontier Joint Research Program Department, Japan Space Utilization Promotion Center, 30–16, Nishi–Waseda 3–chome, Shinjuku–, Tokyo 169–, Japan