1. Department of Materials Science and Technology, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan
2. Department of Materials Science and Technology, Graduate School of Tokyo University of Science, Katsushika-ku, Tokyo
3. Itochu Techno-Solutions Co, Chiyoda-ku, Tokyo
4. Aeronautical Technology Directorate, Japan Aerospace Exploration Agency, Mitaka, Tokyo
5. Exabyte Inc., San Francisco, CA 94103, USA