**6. Acknowledgment**

This research has been partially supported by the Management Expenses Grants for National Universities Corporations and a Grant-in-Aid for Young Scientists from The Ministry of Education, Culture, Sports, Science and Technology (MEXT), Precursory Research for Embryonic Science and Technology program from Japan Science and Technology Agency (JST) and a Grant-in-Aid for Scientific Research from Japan Society for the Promotion of Science (JSPS). The authors would like to express their sincere appreciation to Dr. M. Hirasaka of Teijin Ltd. and Research Manager K. Kubo of Teijin DuPont Films Japan Ltd. for supplying PEN organic films, Prof. Y. Hirotsu, Assoc. Prof. M. Ishimaru and Assist. Prof. A. Hirata at Osaka University for investigating cross-sectional TEM images and ED patterns, Y. Inoue of Meiwafosis Co., Ltd. for examining the fabrication of NiO insulators and Prof. M. Yamamoto, Assist. Prof. K. Matsuda, A. Ono, N. Basheer, N. Kawaguchi, S. White, H. Sato and M. Takei at Hokkaido University for their cooperation and helpful discussions.
