1. Department of Material Science, Graduate School of Science, University of Hyogo 1 , Ako-gun, Hyogo 678-1297, Japan
2. Japan Synchrotron Radiation Research Institute 2 , Sayo, Hyogo 679-5198, Japan
3. Graduate School of Advanced Science and Engineering, Hiroshima University 3 , Higashi-Hiroshima, Hiroshima 739-8526, Japan
4. Institute for Materials Research, Tohoku University 4 , Sendai, Miyagi 980-8577, Japan
5. Center for Spintronics Research Network, Tohoku University 5 , Sendai, Miyagi 980-8577, Japan
6. Center for Science and Innovation in Spintronics, Tohoku University 6 , Sendai, Miyagi 980-8577, Japan
7. Faculty of Engineering, Hiroshima Institute of Technology 7 , Hiroshima, Hiroshima 731-5193, Japan
8. Institute of Laser Engineering, Osaka University 8 , Suita, Osaka 565-0871, Japan