TY - JOUR
T1 - Intrinsic single-domain switching in ferroelectric materials on a nearly ideal surface
JF - Proceedings of the National Academy of Sciences of the United States of America
Y1 - 2007/
SP - 20204
EP - 20209
A1 - S.V. Kalinin
A1 - B.J. Rodriguez
A1 - S. Jesse
A1 - Y.H. Chu
A1 - T. Zhao
A1 - Ramamoorthy Ramesh
A1 - S. Choudhury
A1 - L.Q. Chen
A1 - E.A. Eliseev
A1 - A.N. Morozovska
KW - Article
KW - calculation
KW - electrochemical analysis
KW - energy
KW - iron derivative
KW - kinetics
KW - Materials testing
KW - phase transition
KW - priority journal
KW - protein domain
KW - spectroscopy
KW - thermodynamics
AB - Ferroelectric domain nucleation and growth in multiferroic BiFeO3 is studied on a single-domain level by using piezoresponse force spectroscopy. Variation of local electromechanical response with dc tip bias is used to determine the size of the domain formed below the conductive scanning probe tip. The domain parameters are calculated self-consistently from the decoupled Green function theory by using tip geometry determined from the domain wall profile. The critical parameters of the nucleating domain and the activation energy for nucleation are determined. The switching mechanism is modeled by using the phase-field method, and comparison with experimental results shows that the nucleation biases are within a factor of ≈2 of the intrinsic thermodynamic limit. The role of atomic-scale defects and long-range elastic fields on nucleation bias lowering is discussed. These measurements open a pathway for quantitative studies of the role of a single defect on kinetics and thermodynamics of first order bias-induced phase transitions and electrochemical reactions. © 2007 by The National Academy of Sciences of the USA.
VL - 104
N1 - cited By 67
ER -