Affiliation: | a Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan b Magnetic Materials Center, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba 305-0047, Japan c CREST, Japan Science and Technology Agency, Japan d Magnetic Materials Research Laboratory, NEOMAX Company, Hitachi Metals Ltd., Osaka 618-0013, Japan |