Abstract
AbstractEpitaxial CoFe2O4 (CFO) and SrRuO3 (SRO) nanopillar heterostructures were deposited on Pb(Mg1/3Nb2/3)0.70Ti0.30O3 (PMN‐30PT) single crystal substrates by switch pulsed laser deposition (SPLD). Since the CFO nanopillars are insulating, and the SRO matrix conductive, this self‐assembled nanopillar heterostructure served as a patterned electrode on PMN‐PT, which then enhances the dielectric and piezoelectric constant of the substrate. Cross‐sectional electron microscopy images revealed the formation of a nanopillar heterostructure layer with CFO nanopillars within a SRO matrix. AFM and XRD revealed good topography and epitaxy, indicating a high quality SRO‐CFO self‐assembled nanopillar structure. Using a SRO‐CFO thin film patterned electrode, PMN‐PT was found to have a notably higher (30%) dielectric constant with increasing electric field and enhanced transverse broadening in reciprocal spacing mapping (RSM) scans.
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