1. Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
2. Department of Applied Physics, Graduate School of Engineering, Tohoku University, 6-6-05 D08 Aoba Aramaki, Aoba-ku, Sendai, Miyagi980-8579, Japan
3. Center for Innovative Integrated Electronics Systems, Tohoku University, 468-1 Aoba Aramaki, Aoba-ku, Sendai, Miyagi 980-8572, Japan
4. Center for Spintronics Integrated Systems, Tohoku University, 2-2-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
5. Center for Spintronics Research Network, Tohoku University, 2-2-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan