1. Research Center for Advanced Measurement and Characterization, National Institute for Materials Science, Tsukuba, Japan
2. Synchrotron X-ray Station at SPring-8, National Institute for Materials Science, Hyogo, Japan
3. Institute for Materials Research, Tohoku University, Sendai, Japan
4. Center for Spintronics Research Network, Tohoku University, Sendai, Japan
5. CREST, Japan Science and Technology Agency, Kawaguchi, Japan
6. Research Institute of Electrical Communication, Tohoku University, Sendai, Japan
7. Center for Science and Innovation in Spintronics (Core Research Cluster), Tohoku University, Sendai, Japan