[1] ASTAR, Data Storage Inst, Singapore 117608, Singapore
[2] Carnegie Mellon Univ, Dept Elect & Comp Engn, Pittsburgh, PA 15213 USA
[3] Tsinghua Univ, Dept Precis Instrument, Opt Memory Natl Engn Res Ctr, Beijing 100084, Peoples R China
[4] Singapore Univ Technol & Design, Singapore 138682, Singapore
[5] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China
[6] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117576, Singapore
[7] Carnegie Mellon Univ, Dept Mech Engn, Pittsburgh, PA 15213 USA