Domain Nucleation and Hysteresis Loop Shape in Piezoresponse Force Spectroscopy

Details Domain Nucleation and Hysteresis Loop Shape in Piezoresponse Force Spectroscopy Domain Nucleation and Hysteresis Loop Shape in Piezoresponse Force Spectroscopy

2006-05-31

arxiv.org/abs/cond-mat/0605749v1

Physics

Condensed Matter

Materials Science

18 pages, 4 figures, 3 appendices, submitted to Appl. Phys. Lett

Scientific paper

10.1063/1.2378526

Electromechanical hysteresis loop measurements in Piezoresponse Force Microscopy (Piezoresponse Force Spectroscopy) have emerged as a powerful technique for probing ferroelectric switching behavior on the nanoscale. Interpretation of PFS data requires the relationship between the domain parameters and PFM signal to be established. Here, we analyze the switching process using a modified point charge model for the electric field of the tip. The charge value and position are selected so that its electric field isopotential surface reproduces the tip with definite radius of curvature. Using linear theory of elasticity the relationship between the sizes of semiellipsoidal domain and PFM signal has been derived. The role of domain nucleation on piezoresponse hysteresis loop is established.

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