1. Center for Innovative Integrated Electronic Systems, Tohoku University, 468-1 Aza-aoba, Aramaki, Aoba-ku, Sendai 980-8572, Japan
2. Japan Science and Technology (JST)—ACCEL, 4-1-8 Honmachi, Kawaguchi, Saitama, 332-0012, Japan
3. Research & Utilization Division, Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
4. Center for Spintronics Integrated Systems (CSIS), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
5. Center for Spintronics Research Network (CSRN), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
6. Graduate School of Engineering, Tohoku University, 6-6 Aza-aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan