1. WPI Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
2. JEOL Ltd., Tokyo 196-8558, Japan
3. Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
4. New Industry Creation Hatchery Center, Tohoku University, Sendai 980-8579, Japan
5. Institute of Multidisciplinary Research for Advanced Materials, Sendai 980-8577, Japan