Imaging ferroelectric hysteresis and domain wall pinning

Details Imaging ferroelectric hysteresis and domain wall pinning Imaging ferroelectric hysteresis and domain wall pinning

2009-12-31

arxiv.org/abs/1001.0099v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Simultaneous imaging of the piezoresponse phase, amplitude and bare surface topography of displacive ferroelectric thin films by scanning probe microscopy directly shows the nature of domain wall pinning and its relation to morphological disorder. Strong and stable pinning of walls occurs at grain boundaries while weak and unstable pinning occurs within the grains. The results show that polarization reversal consists of both nucleation of domains and spreading of domain walls, the latter being the dominant process in multi-grain regions. A characteristic single-grain switching in faceted grains is observed as the motion of a single domain wall parallel to one of the facets.

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