1. Center for Innovative Integrated Electronics Systems; Tohoku University; Sendai Japan
2. Center for Spintronics Integrated Systems; Tohoku University; Sendai Japan
3. Laboratory for Brainware Systems; RIEC, Tohoku University; Sendai Japan
4. Department of Electrical Engineering; Tohoku University; Sendai Japan
5. System Platform Research Laboratories, NEC Corporation; Tsukuba Japan
6. Frontier Research Institute for Interdisciplinary Sciences; Tohoku University; Sendai Japan
7. Laboratory for Nanoelectronics and Spintronics; RIEC, Tohoku University; Sendai Japan