[1] Department of Advanced Materials Science, University of Tokyo, 5-1-5-503 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
[2] Tsukuba Magnet Laboratory, National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan
[3] Department of Machine Intelligence and Systems Engineering, Akita Prefectural University, 84-4 Ebinokuchi, Tsuchlya-aza, Honjyo, Akita 015-0055, Japan
[4] Consortium de Recherches pour L'Émergence de Technologies Avancées, Centre National de la Recherche Scientifique, 25, avenue des Martyrs, 38042 Grenoble Cedex 09, France