1. WPI‐Advanced Institute for Materials Research Tohoku University Sendai 980‐8577 Japan
2. Graduate School of Engineering Tohoku University Sendai 980‐8577 Japan
3. Institute of Engineering Innovation The University of Tokyo Tokyo 116‐0013 Japan
4. New Industry Creation Hatchery Center Tohoku University Sendai 980‐8579 Japan
5. Graduate School of Engineering Nagoya University Nagoya 464‐8603 Japan
6. Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai 980‐8577 Japan
7. Nanostructure Research Laboratory Japan Fine Ceramics Center Nagoya 456‐8587 Japan