TY - JOUR
KW - Polarization
KW - Ferroelectric materials
KW - Polarization switching
KW - Superlattices
KW - Ferroelectricity
KW - Dielectric materials
KW - Permittivity
KW - Phase boundaries
KW - Artificial superlattices
KW - Dielectric permittivities
KW - Dielectric susceptibility
KW - Ferroelectric polarization
KW - First-order reversal curves
KW - Morphotropic phase boundaries
KW - Superlattice periodicity
AU - E Lupi
AU - A Ghosh
AU - S Saremi
AU - S.-L Hsu
AU - S Pandya
AU - G Velarde
AU - A Fernandez
AU - Ramamoorthy Ramesh
AU - L.W Martin
AB - The ability to produce atomically precise, artificial oxide heterostructures allows for the possibility of producing exotic phases and enhanced susceptibilities not found in parent materials. Typical ferroelectric materials either exhibit large saturation polarization away from a phase boundary or large dielectric susceptibility near a phase boundary. Both large ferroelectric polarization and dielectric permittivity are attained wherein fully epitaxial (PbZr0.8Ti0.2O3)n/(PbZr0.4Ti0.6O3)2 n (n = 2, 4, 6, 8, 16 unit cells) superlattices are produced such that the overall film chemistry is at the morphotropic phase boundary, but constitutive layers are not. Long- (n ≥ 6) and short-period (n = 2) superlattices reveal large ferroelectric saturation polarization (Ps = 64 µC cm−2) and small dielectric permittivity (εr ≈ 400 at 10 kHz). Intermediate-period (n = 4) superlattices, however, exhibit both large ferroelectric saturation polarization (Ps = 64 µC cm−2) and dielectric permittivity (εr = 776 at 10 kHz). First-order reversal curve analysis reveals the presence of switching distributions for each parent layer and a third, interfacial layer wherein superlattice periodicity modulates the volume fraction of each switching distribution and thus the overall material response. This reveals that deterministic creation of artificial superlattices is an effective pathway for designing materials with enhanced responses to applied bias. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
BT - Advanced Electronic Materials
DO - 10.1002/aelm.201901395
LA - eng
M1 - 3
N1 - cited By 1
N2 - The ability to produce atomically precise, artificial oxide heterostructures allows for the possibility of producing exotic phases and enhanced susceptibilities not found in parent materials. Typical ferroelectric materials either exhibit large saturation polarization away from a phase boundary or large dielectric susceptibility near a phase boundary. Both large ferroelectric polarization and dielectric permittivity are attained wherein fully epitaxial (PbZr0.8Ti0.2O3)n/(PbZr0.4Ti0.6O3)2 n (n = 2, 4, 6, 8, 16 unit cells) superlattices are produced such that the overall film chemistry is at the morphotropic phase boundary, but constitutive layers are not. Long- (n ≥ 6) and short-period (n = 2) superlattices reveal large ferroelectric saturation polarization (Ps = 64 µC cm−2) and small dielectric permittivity (εr ≈ 400 at 10 kHz). Intermediate-period (n = 4) superlattices, however, exhibit both large ferroelectric saturation polarization (Ps = 64 µC cm−2) and dielectric permittivity (εr = 776 at 10 kHz). First-order reversal curve analysis reveals the presence of switching distributions for each parent layer and a third, interfacial layer wherein superlattice periodicity modulates the volume fraction of each switching distribution and thus the overall material response. This reveals that deterministic creation of artificial superlattices is an effective pathway for designing materials with enhanced responses to applied bias. © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PB - Blackwell Publishing Ltd
PY - 2020
T2 - Advanced Electronic Materials
TI - Large Polarization and Susceptibilities in Artificial Morphotropic Phase Boundary PbZr1− xTixO3 Superlattices
VL - 6
SN - 2199160X
ER -