1. Division of Materials Physics, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
2. RIKEN SPring-8 Center, Sayo, Hyogo 679-5158, Japan
3. Spintronics Research Network Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University, Suita, Osaka 565-0871, Japan
4. Faculty of Science and Engineering, Setsunan University, Neyagawa, Osaka 572-8508, Japan
5. Faculty of Science and Engineering, Konan University, Kobe 658-8501, Japan
6. Department of Physical Sciences, Faculty of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
7. Department of Materials Science and Technology, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan