[1] Department of Physics, Faculty of Scince, Ehime Univerity, 2-5, Bunkyo-cho, Matsuyama 790-8577, Japan
[2] Department of Materials Science and Engineering, Faculty of Engineering, Ehime University, Matsuyama 790-8577, Japan
[3] Department of Surgery II, Ehime University, Shigenobu 791-0295, Japan