1. Department of Physics, Aichi University of Education, Hirosawa 1, Igayacho, Kariya 448-8542, Japan
2. Research Department, Taiho Kogyo Co., Ltd., 2-47 Hosoya-Cho, Toyota 471-8502, Japan
3. Aichi Industrial Technology Institute, 1-157-1, Ondacho, Kariya 448-0013, Japan
4. Department of Applied Physics and Chemistry, University of Electro-Communications, 1-5-1 Chohugaoka, Chofu, Tokyo 182-8585, Japan
5. Department of Materials and Life Science, Faculty of Science and Technology, Seikei University, 3-3-1 Kichijoji-Kitamachi, Musashino, Tokyo 180-8633, Japan