Evolution of polarization and space charges in semiconducting ferroelectrics
Phanish Suryanarayana and Kaushik Bhattacharya
Ferroelectric perovskites and polymers that are used in a variety of electronic, ultrasonic, and optical applications are often wide-band-gap semiconductors. We present a time-dependent and thermodynamically consistent theory that describes the evolution of polarization and space charges in such mat ... [J. Appl. Phys. 111, 034109 (2012)] published Mon Feb 13, 2012.
Absence of Ferroelectric Critical Size in Ultrathin PbTiO Nanotubes: A Density-Functional Theory Study
Takahiro Shimada, Xiaoyuan Wang, Yoshiaki Kondo, and Takayuki Kitamura
We simulate from first principles the energetic, structural, and electronic properties of ferroelectric (FE) ultrathin PbTiO nanotubes. The nanotube possesses spontaneous polarization despite their sidewalls being thinner than the critical thickness at which the thin films lose ferroelectricity; thi ... [Phys. Rev. Lett. 108, 067601 ] published .
Nonlinearity in the high-electric-field piezoelectricity of epitaxial BiFeO on SrTiO
Pice Chen, Rebecca J. Sichel-Tissot, Ji Young Jo, Ryan T. Smith, Seung-Hyub Baek et al.
The piezoelectricity of a multiferroic BiFeO thin film deviates from its low-field linear response in electric fields higher than 150 MV/m. Time-resolved synchrotron x-ray microdiffraction reveals a low-field piezoelectric coefficient of 55 pm/V and a steeper increase in strain at higher fields, wit ... [Appl. Phys. Lett. 100, 062906 (2012)] published Fri Feb 10, 2012.
Non-radiative complete surface acoustic wave bandgap for finite-depth holey phononic crystal in lithium niobate
Didit Yudistira, Yan Pennec, Bahram Djafari Rouhani, Samuel Dupont, and Vincent Laude
We demonstrate the existence of non-radiative complete surface acoustic wave (SAW) bandgaps for two-dimensional piezoelectric phononic crystals of holes. Holes of finite depth in a semi-infinite LiNbO substrate are specifically considered. SAW bandgaps are determined from the band structure calculat ... [Appl. Phys. Lett. 100, 061912 (2012)] published Fri Feb 10, 2012.
Piezoelectric 36-shear mode for [011] poled 24%Pb(InNb)O-Pb(MgNb)O-PbTiO ferroelectric crystal
Weiling Yan, Pengdi Han, and Zibo Jiang
Superior piezoelectric 36-shear mode of [011] poled Pb(MgNb)O-PbTiO (PMN-PT) in zxt+/45 cut direction is the first practical piezoelectric 36-shear mode reported [P. Han, Piezoelectric crystal elements of shear mode and process for preparation, U.S. patent 7,908,722 B2 (2004)]. The investigation on ... [J. Appl. Phys. 111, 034107 (2012)] published Thu Feb 9, 2012.
Influence of ferroelectric poling induced strain on magnetic and electric properties in tetravalent cation-doped LaHfMnO films
Z. P. Wu, L. Wang, E. J. Guo, and J. Gao
Electron-doped manganites LaHfMnO (LHMO) films were epitaxially grown on 0.67Pb(MgNb)O-0.33PbTiO (PMN-PT) substrates. The effects of the strain induced by ferroelectric poling on the magnetic and electric properties have been investigated. The polarization of the PMN-PT crystal reduces the biaxial t ... [J. Appl. Phys. 111, 07E105 (2012)] published Thu Feb 9, 2012.
Spin frustration destruction and ferroelectricity modulation in CaCoMnO: Effects of Mn deficiency
L. Lin, Y. J. Guo, Y. L. Xie, S. Dong, Z. B. Yan et al.
We present careful experiments on the spin order and multiferroicity of Mn-deficient CaCoMnO with respect to the Co/Mn compensated CaCoMnO. It is revealed that a slight destruction of the Co/Mn ionic order does not damage but significantly enhances the ferroelectricity in terms of the transition poi ... [J. Appl. Phys. 111, 07D901 (2012)] published Thu Feb 9, 2012.
Regular nanodomain vertex arrays in BiFeO single crystals
A. Berger, D. Hesse, A. Hahnel, M. Arredondo, and M. Alexe
Domain patterns consisting of triangular nanodomains of less than 50 nm size, arranged into long regular vertex arrays separated by stripe domains, were observed by (scanning and high-resolution) transmission electron microscopy and piezoresponse force microscopy in BiFeO single crystals grown from ... [Phys. Rev. B 85, 064104 ] published .
Brillouin scattering studies of acoustic phonon modes and central peak in single-crystal Pb(ScTa)O
V. Sivasubramanian and S. Kojima
Brillouin spectra measurements have been carried out from 800 to 100 K for Pb(ScTa)O in back-scattering geometry. The frequency of the longitudinal acoustic (LA) phonon begins to show marked softening followed by an increase in its width below the intermediate temperature T = 450 K. The gradual incr ... [Phys. Rev. B 85, 054104 ] published .
Highly piezoelectric biocompatible and soft composite fibers
J. Morvan, E. Buyuktanir, J. L. West, and A. Jakli
We report the fabrication of highly piezoelectric biocompatible soft fibers containing barium titanate ferroelectric ceramic particles dispersed in electrospun poly lactic acid (PLA). These fibers form mats that have two orders of magnitude larger piezoelectric constant per weight than single crysta ... [Appl. Phys. Lett. 100, 063901 (2012)] published Wed Feb 8, 2012.
Phase field simulations of stress controlling the vortex domain structures in ferroelectric nanosheets
W. J. Chen, Yue Zheng, and Biao Wang
Effect of stress loads on the vortex domain structures (VDSs) in ferroelectric nanosheet has been investigated. Results of phase field simulations show that the different vortex domain structures can form in free-standing nanosheet from random perturbations. Applying stress loads on nanosheet, it is ... [Appl. Phys. Lett. 100, 062901 (2012)] published Wed Feb 8, 2012.
Dynamic hysteresis of tetragonal ferroelectrics: The resonance of 90 degrees -domain switching
D. P. Chen and J.-M. Liu
The dynamic hysteresis of ferroelectric lattice with 90 degrees -domain structure in response to time-varying electric field of frequency omega and amplitude E is investigated using Monte Carlo simulation based on the Ginzburg-Landau phenomenological theory. A resonance mode of the polarization swit ... [Appl. Phys. Lett. 100, 062904 (2012)] published Wed Feb 8, 2012.
Ionic-liquid-induced ferroelectric polarization in poly(vinylidene fluoride) thin films
Feipeng Wang, Alexander Lack, Zailai Xie, Peter Frubing, Andreas Taubert et al.
Thin films of ferroelectric beta-phase poly(vinylidene fluoride) (PVDF) were spin-coated from a solution that contained small amounts of the ionic liquid (IL) 1-ethyl-3-methylimidazolium nitrate. A remanent polarization of 60 mC/m and a quasi-static pyroelectric coefficient of 19 [mu]C/mK at 30 deg ... [Appl. Phys. Lett. 100, 062903 (2012)] published Wed Feb 8, 2012.
Dielectric properties of Yb and Nb doped RbTiOPO single crystals
Jna. Gavalda, J. J. Carvajal, X. Mateos, M. Aguilo, and F. Diaz
The influence of niobium and ytterbium doping in the electrical properties of the RbTiOPO (RTP) crystals has been analyzed along the three crystallographic axes. While Yb does not change the ionic conductivity of RTP, Nb increases it considerably. These effects are also observed for the activation e ... [J. Appl. Phys. 111, 034106 (2012)] published Tue Feb 7, 2012.
Growth and piezo-/ferroelectric properties of PIN-PMN-PT single crystals
Xiuzhi Li, Zujian Wang, Chao He, Xifa Long, and Zuo-Guang Ye
Ternary solid solution crystals of 0.19Pb(InNb)O 0.46Pb(MgNb)O 0.35PbTiO [PIMNT(19/46/35)] with dimensions of 35 x 38 x 15 mm were grown by the top-seeded solution growth (TSSG) method. The dielectric, piezo- and ferroelectric properties of the grown crystals were characterized. The ternary piez ... [J. Appl. Phys. 111, 034105 (2012)] published Tue Feb 7, 2012.
High performance ferroelectric relaxor-PbTiO single crystals: Status and perspective
Shujun Zhang and Fei Li
Ferroelectrics are essential components in a wide range of applications, including ultrasonic transducers, sensors, and actuators. In the single crystal form, relaxor-PbTiO (PT) piezoelectric materials have been extensively studied due to their ultrahigh piezoelectric and electromechanical propertie ... [J. Appl. Phys. 111, 031301 (2012)] published Tue Feb 7, 2012.
Evidence of oxygen-dependent modulation in LuFeO
J. Bourgeois, M. Hervieu, M. Poienar, A. M. Abakumov, E. Elkaim et al.
A polycrystalline sample of LuFeO has been investigated by means of powder synchrotron x-ray and neutron diffraction and transmission electron microscopy (TEM), along with Mossbauer spectroscopy and transport and magnetic properties. A monoclinic distortion is unambiguously evidenced, and the crysta ... [Phys. Rev. B 85, 064102 ] published .
Domain wall nanoelectronics
G. Catalan, J. Seidel, R. Ramesh, and J. F. Scott
Domains in ferroelectrics were considered to be well understood by the middle of the last century: They were generally rectilinear, and their walls were Ising-like. Their simplicity stood in stark contrast to the more complex Bloch walls or Neel walls in magnets. Only within the past decade and with ... [Rev. Mod. Phys. 84, 119 ] published .
Dielectric relaxation in the DyMnFeO system
Fang Hong, Zhenxiang Cheng, Shujun Zhang, and Xiaolin Wang
The dielectric constant and loss of perovskite DyMnFeO samples show strong dispersion in various frequencies, which is indicative of relaxation. The activation energies were obtained through Arrhenius law fitting and range from 0.213 eV to 0.385 eV. The Fe content dependence of the characteristic fr ... [J. Appl. Phys. 111, 034104 (2012)] published Fri Feb 3, 2012.
Characteristics of thickness-shear modes excited by two-layer piezoelectric film in acoustic sensors
Hui Zhang, Shu-yi Zhang, Li Fan, and Yu-ran Wang
The thickness-shear mode (TSM) excited by two-layer, (11[overline 2]0)-textured, hexagonal piezoelectric film is studied to improve the performances of the acoustic sensors. The corresponding theoretical model is presented by the acoustic wave propagation theory in multi-layer structure combined wit ... [J. Appl. Phys. 111, 033504 (2012)] published Fri Feb 3, 2012.
Modeling functional piezoelectricity in perovskite superlattices with competing instabilities
Charles W. Swartz and Xifan Wu
Based on the locality principle of insulating superlattices, we apply the method of Wu et al. [Phys. Rev. Lett. 101, 087601 (2008)] to the piezoelectric strains of individual layers under a fixed displacement field. For a superlattice of arbitrary stacking sequence, an accurate model is acquired for ... [Phys. Rev. B 85, 054102 ] published .