1. Institute of Engineering Innovation, The University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
2. Advanced Material Engineering Division, Toyota Motor Corporation, 1200, Mishuku, Susono, Shizuoka 410-1193, Japan
3. Nano Structures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Matsuno, Atsuta-ku, Nagoya 456-8587, Japan