1. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2‐1‐1, Katahira, Aoba‐ku, Sendai 980‐8577 (Japan) http://www.tagen.tohoku.ac.jp/labo/kinbara/index.html
2. Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, 4‐1‐8, Honcho, Kawaguchi, Saitama 332‐0012 (Japan)
3. Advanced Key Technologies Division, National Institute for Materials Science, 1‐2‐1 Sengen, Tsukuba, Ibaraki 305‐0047 (Japan)