1. Institute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
2. University Grenoble Alpes, CEA, CNRS, Grenoble 38000, France
3. Department of Pure and Applied Physics, Faculty of Engineering Science, Kansai University, Suita 564-8680, Japan
4. Center for Spintronics Research Network, Osaka University, Toyonaka 560-8531, Japan
5. Research Center for Magnetic and Spintronic Materials, National Institute for Materials Science (NIMS), Tsukuba 305-0047, Japan