1. Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, Korimoto 1-21-35, Kagoshima 890-0065, Japan
2. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
3. Center for Spintronics Research Network (CSRN), Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
4. National Institute for Materials Science (NIMS), Sengen 1-2-1, Tsukuba 305-0047, Japan
5. Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands
6. High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan
7. Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region 141700, Russia