1. Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
2. National Institute for Materials Science, Tsukuba 305-0047, Japan
3. PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan
4. IoT Devices Research Laboratories, NEC Corporation, Tsukuba 305-8501, Japan
5. Spin Quantum Rectification Project, ERATO, Japan Science and Technology Agency, Sendai 980-8577, Japan
6. Nuclear Science and Engineering Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan
7. WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
8. Research Center, Asahi Glass Co., Ltd., Yokohama 221-8755, Japan
9. Center for Spintronics Research Network, Tohoku University, Sendai 980-8577, Japan
10. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan