1. Magnetic Powder Metallurgy Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 2266-98 Anagahora, Shimoshidami, Moriyama, Nagoya 463-8560, Japan
2. Materials Development Center, TDK Corporation, 570-2 Matsugasita, Minamihadori, Narita 268-8588, Japan