**Acknowledgements**

This study was supported by the Japan Science and Technology Agency (CREST/"Establishment of Innovative Manufacturing Technology Based on Nanoscience"); "Super Highway": the accelerated research to bridge university IPs and practical use; and Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan (24350085 and 16H02282). The authors thank Oxford Instruments KK (Dr. H. Sugasawa), Dr. Y. Nishikawa (High Energy Accelerator Research Organization), Dr. H. Makio (High Energy Accelerator Research Organization), and Ms. Y. Akiyoshi (Oita University) for the assistance with this study.
