1. World Premier International (WPI) Research Center for Materials Nanoarchitectonics (MANA); National Institute for Materials Science (NIMS); 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
2. Faculty of Science and Engineering; Waseda University; 3-4-1 Okubo Shinjuku Tokyo 169-8555 Japan
3. Magnetic Materials Unit, National Institute for Materials Science; 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan
4. Materials Processing Unit, National Institute for Materials Science; 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan
5. Precursory Research for Embryonic Science and Technology (PRESTO); Japan Science and Technology Agency (JST); 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan