1. International Center for Materials Nanoarchitectonics (WPI-MANA); National Institute for Materials Science (NIMS); 1-1 Namiki Tsukuba 305-0044 Japan
2. Core Research for Evolutional Science and Technology (CREST); Japan Science and Technology Agency (JST); 5 Sanbancho, Chiyoda-ku Tokyo 102-0075 Japan
3. Peter Gruenberg Institute (Electric Materials); Forschungszentrum Jülich; 52425 Jülich Germany
4. Institut für Werkstoffe der Elektrotecknik 2 (IWE2); RWTH Aachen; 52074 Aachen Germany