1. Center for Innovative Integrated Electronics Systems (CIES), Tohoku University, Sendai, Miyagi 980-8572, Japan
2. Center for Science and Innovation in Spintronics (CSIS), Tohoku University, Sendai, Miyagi 980-8577, Japan
3. Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
4. Graduate School of Engineering, Kobe University, Kobe, Hyogo 657-8501, Japan
5. Research Institute of Electrical Communication, Tohoku University, Sendai, Miyagi 980-8577, Japan
6. Center for Spintronics Research Network (CSRN), Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
7. Slow Positron Facility, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan
8. Center for Spintronics Research Network (CSRN), The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
9. Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
10. Department of Materials Science and Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, Shinjuku-ku, Tokyo 169-8555, Japan
11. Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
12. Université Paris-Saclay, 91767 Palaiseau, France
13. Engineering Department, Cambridge University, Cambridge CB2 1PZ, United Kingdom
14. Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan