1. Laboratory for Nanoelectronics and SpintronicsResearch Institute of Electrical CommunicationTohoku University 2‐1‐1 Katahira Aoba‐ku Sendai 980‐8577 Japan
2. Center for Science and Innovation in Spintronics (Core Research Cluster)Tohoku University 2‐1‐1 Katahira Aoba‐ku Sendai 980‐8577 Japan
3. Center for Spintronics Research NetworkTohoku University 2‐1‐1 Katahira Aoba‐ku Sendai 980‐8577 Japan
4. Center for Spintronics Integrated SystemsTohoku University 2‐1‐1 Katahira Aoba‐ku Sendai 980‐8577 Japan
5. Frontier Research Institute for Interdisciplinary SciencesTohoku University 6‐3 Aramaki Aza Aoba Aoba‐ku Sendai 980‐8578 Japan
6. Center for Innovative Integrated Electronic SystemsTohoku University 468‐1 Aramaki Aza Aoba Aoba‐ku Sendai 980‐0845 Japan