1. Department of Materials Science and Engineering, Graduate School of Science and Engineering, Ibaraki University, 4-12-1, Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
2. Department of Materials Science and Engineering, College of Engineering, Ibaraki University, 4-12-1, Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
3. Samsung Device Solutions R&D Japan, Samsung Japan Corporation, 2-1-11 Senba-nishi, Minoh, Osaka 562-0036, Japan