Direct observations

Lim, J.S, J.H Lee, H.-S Park, R Gao, T.Y Koo, L.W Martin, Ramamoorthy Ramesh, and C.-H Yang. "Ultrafast collective oxygen-vacancy flow in Ca-doped BiFeO3." NPG Asia Materials 10 (2018) 943–955.

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Nath, R, N Polomoff, J Bosse, Y.H Chu, Ramamoorthy Ramesh, and B.D Huey. "High speed piezo force microscopy: Nanoscale and nanosecond direct observations of domain switching." IEEE International Symposium on Applications of Ferroelectrics. Vol. 1. 2008.