1. Graduate School of Science and Engineering
2. Waseda University
3. Tokyo 169-8555
4. Japan
5. WPI Center for Materials Nanoarchitectonics
6. National Institute for Materials Science
7. Tsukuba
8. Peter Gruenberg Institute 7 (Electronic Materials) JARA-FIT
9. Forschungszentrum Jülich
10. D-52425 Jülich
11. Germany