1. Institute for Superconducting and Electronic Materials; University of Wollongong; Wollongong New South Wales 2500 Australia
2. Research Facility Center; Graduate Institute for Ferrous Technology; Pohang University of Science and Technology; Pohang 790-784 Kyungbuk Korea
3. Graduate School of Engineering; Toin University of Yokohama; 1614 Kurogane Aoba Yokohama Kanagawa 225-8503 Japan