1. WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
2. Institute of Engineering
Innovation, University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
3. Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
4. Center for Spintronics Integrated Systems, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
5. Center for Innovative
Integrated Electronic Systems, Tohoku University, 468-1 Aramaki, Aza, Aoba-ku, Sendai 980-8577, Japan
6. Laboratory for Nanoelectronics and Spintronics,
Research Institute of Electrical Communication, Tohoku University, 2-1-1
Katahira, Aoba-ku, Sendai 980-8577, Japan
7. Nanostructures Research Laboratory, Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta, Nagoya 456-8587, Japan