1. Institute of Scientific and Industrial Research (SANKEN), Osaka University 1 , Ibaraki, Osaka 567-0047, Japan
2. Center for Spintronics Research Network at Osaka, Osaka University 2 , Toyonaka, Osaka 560-8531, Japan
3. JST, PRESTO 3 , 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
4. Division of Spintronics Research Network, Institute for Open and Transdisciplinary Research Initiatives, Osaka University 4 , Osaka 565-0871, Japan
5. International Center for Synchrotron Radiation Innovation Smart, Tohoku University 5 , Sendai, 980-8577, Japan