1. Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1 Katahira, Aoba-ku Sendai 980-8577 Japan
2. Graduate School of Engineering Tohoku University 6-6 Aramaki Aza Aoba, Aoba-ku Sendai 980-8579 Japan
3. Research and Engineering Center Nippon Steel Co. 20-1 Shintomi Futtsu 293-8511 Japan