[1] Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
[2] NeosemiTech. Corporate, 357-13 Dangha-dong, Seo-ku, Inchon 404-30, Korea, Republic of
[3] Department of Applied Physics, Korea Maritime University, I Dongsam-dong, Yeoungdo-koo, Pusan 606-791, Korea, Republic of
[4] Department of Physics, Fudan University, 220 Handan Road, Shanghai 200433, China
[5] Ctr. for Interdisciplinary Research, Tohoku University, Aramakiazaaoba, Aoba-ku, Sendai 980-8578, Japan