1. Department of Physics, College of Science, University of the Ryukyus, Nishihara, Okinawa 903-01
2. Institute for Materials Research, Tohoku University, Sendai, Miyagi 980
3. Department of Materials Science and Engineering, Faculty of Engineering, Ehime University, Matsuyama, Ehime 790
4. Department of Applied Physics, Faculty of Engineering, Tohoku University, Sendai, Miyagi 980