Yusuke Hara1, Ryo Yoshida. 1. Department of Materials Engineering, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan; Department of Applied Physics, Graduate School of Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, 169-8555, Japan. yhara@shalab.phys.waseda.ac.jp.