1. Department of Mechanical and Industrial Engineering, University of Toronto, 5 King’s College Road, Toronto, Ontario M5S 3G8, Canada.
2. Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto, Ontario M5S 3E4, Canada.
3. Hitachi High-Technologies Canada Inc., Toronto, Ontario M9W 6A4, Canada.
4. Nanotechnology Systems Division, Hitachi High-Technologies America Inc., 22610 Gateway Center Drive, Suite 100, Clarksburg, MD 20871, USA.