1. Fuji Electric Co., Ltd., 1, Fuji-machi, Hino-City, Tokyo 191-8502 Japan
2. Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
3. Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan