1. Sun Yat-sen University–Carnegie Mellon University Joint Institute of Engineering, School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, China
2. Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
3. Data Storage Systems Center, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
4. ALCOA Professor of Physical Metallurgy, Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA