1. National Institute of Technology, Oita College, 1666 Maki, Oita 870-0152, Japan
2. Vector Magnetic Characteristic Technical Laboratory, 533 Joi Usa-city, Oita 879-0442, Japan
3. Yoshikawa Kogyo CO., LTD., 1-2, Ogura 2-chome, Yahatahigashi-ku, Kitakyushu-shi, Fukuoka 805-8501, Japan
4. Nippon Kinzoku CO., LTD., 5-30-7 Shiba, Minato-ku, Tokyo 108-0014, Japan