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Strained bismuth ferrite thin films unite a wealth of functional properties including ferroelectricity, ferromagnetism, electrooptic coupling and interface-mediated conductivity. The coexistence of rhombohedral (R) and tetragonal (T) phases in these films further contributes to their versatility, as structural transitions can modify functional behavior and be leveraged to engineer properties such...
Nonvolatile bias-controlled polarization states in ferroelectric materials offer unique opportunities for information technology and data storage applications. The ability to probe ferroelectric properties at the nanoscale by piezoresponse force microscopy (PFM) has enabled fundamental studies of polarization dynamics and the role of defects and disorder on domain nucleation and wall motion and has...
Metallic nanostructures made from ‘coinage’ metals such as silver or gold, yield plasmons when light creates a collective oscillation of the conduction electrons on the surface of the metal, creating a greatly enhanced electromagnetic field [1-3]. The specific properties of the plasmonic structures have been found to be greatly dependent on factors such as size, shape, and dielectric environment [1-3]...
In this work, we implemented dual harmonic Kelvin probe force microscopy (DH-KPFM) for surface potential mapping of ferroelectric thin films, namely bismuth ferrite (BFO) and strontium barium niobate (SBN). We applied DH and conventional KPFM to charge-patterned BFO and found agreement between recorded relative surface potential values between domains, demonstrating that DH-KPFM can be used for quantitative...
Two-dimensional arrays of ferroelectric lead zirconate titanate (PZT) nanodots fabricated using pulsed laser deposition (PLD) through ultrathin anodic aluminum oxide (AAO) membrane stencil masks have been investigated using piezoresponse force microscopy (PFM). Core-polarization states, which may indicate the presence of quasi-toroidal polarization ordering, have been observed. Existing theoretical...
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