1. Department of Materials Science, Tohoku University, Sendai, Miyagi 980-8579, Japan
2. Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
3. Department of Theoretical and Computational Molecular Science, Institute for Molecular Science, Okazaki, Aichi 444-8585, Japan
4. Department of Materials Engineering, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
5. Department of Advanced Materials Science, The University of Tokyo, Kashiwa, Chiba 277-8561, Japan
6. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
7. Center for Spintronics Research Network, Tohoku University, Sendai, Miyagi 980-8577, Japan
8. Center for Science and Innovation in Spintronics (Core Research Cluster) Organization for Advanced Studies, Tohoku University, Sendai, Miyagi 980-8577, Japan
9. The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
10. Center for Spintronics Research Network, Osaka University, Toyonaka, Osaka 560-8531, Japan