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Tuning Susceptibility via Misfit Strain in Relaxed Morphotropic Phase Boundary PbZr 1‐x Ti x O 3 Epitaxial Thin Films
Author(s) -
Agar J. C.,
Mangalam R. V. K.,
Damodaran A. R.,
Velarde G.,
Karthik J.,
Okatan M. B.,
Chen Z. H.,
Jesse S.,
Balke N.,
Kalinin S. V.,
Martin L. W.
Publication year - 2014
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201400098
Subject(s) - materials science , ferroelectricity , epitaxy , dielectric , phase boundary , condensed matter physics , substrate (aquarium) , thin film , ferroelectric ceramics , crystallography , phase (matter) , analytical chemistry (journal) , optoelectronics , nanotechnology , chemistry , physics , oceanography , organic chemistry , layer (electronics) , geology , chromatography
Epitaxial strain is a powerful tool to manipulate the properties of ferroelectric materials. But despite extensive work in this regard, few studies have explored the effect of epitaxial strain on PbZr 0.52 Ti 0.48 O 3 . Here we explore how epitaxial strain impacts the structure and properties of 75 nm thick films of the morphotropic phase boundary composition. Single‐phase, fully epitaxial films are found to possess “relaxed” or nearly “relaxed” structures despite growth on a range of substrates. Subsequent studies of the dielectric and ferroelectric properties reveal films with low leakage currents facilitating the measurement of low‐loss hysteresis loops down to measurement frequencies of 30 mHz and dielectric response at background dc bias fields as large as 850 kV/cm. Despite a seeming insensitivity of the crystal structure to the epitaxial strain, the polarization and switching characteristics are found to vary with substrate. The elastic constraint from the substrate produces residual strains that dramatically alter the electric‐field response including quenching domain wall contributions to the dielectric permittivity and suppressing field‐induced structural reorientation. These results demonstrate that substrate mediated epitaxial strain of PbZr 0.52 Ti 0.48 O 3 is more complex than in conventional ferroelectrics with discretely defined phases, yet can have a marked effect on the material and its responses.