Kavli Affiliate: Andrea D. Caviglia
| First 5 Authors: Greta Segantini, Ludovica Tovaglieri, Chang Jae Roh, Chih-Ying Hsu, Seongwoo Cho
| Summary:
In this study, we explore the ferroelectric domain structure and mechanical
properties of PbTiO$_3$-based membranes, which develops a well-ordered and
crystallographic-oriented ripple pattern upon release from their growth
substrate. The ferrolectric domain structure of the PbTiO$_3$ layer was
examined at various length scales using optical second harmonic generation,
piezoresponse force microscopy, and scanning transmission electron microscopy.
These methods reveal the presence of purely in-plane domains organized into
superdomains at the crest of the ripples, while an in-plane/out-of-plane domain
structure was observed in the flat regions separating the ripples, in agreement
with phase-field simulations. The mechanical properties of the membrane were
assessed using contact resonance force microscopy, which identified distinct
mechanical behaviors at the ripples compared to the flat regions. This study
shows that the physical properties of the ferroelectric layer in membranes can
be locally controlled within an ordered array of ripples, with well-defined
geometric characteristics.
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