Abstract
We report on switching current measurements of self-assembled PbTiO3 nanoislands with an average height in the range of 4–5 nm and a width of less than 100 nm by scanning probe microscopy (SPM). A blunt SPM tip with a flat end-face with a plateau diameter of 1.8 µm was directly contacted to PbTiO3 nanoislands as a top electrode, which enabled electrical characterization of as-prepared samples without the need for fabricating top electrodes or any preprocessing. Using this SPM system, it was revealed that the nanoislands have switching charge densities as large as 140–170 µC/cm2, comparable to those of epitaxial thin films.
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