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8 Oct 2012

Volume 101, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 101, 153501 (2012); http://dx.doi.org/10.1063/1.4756693 (3 pages)

Brandon G. Cook, William R. French, and Kálmán Varga
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Complex transport behavior accompanying domain switching in La0.1Bi0.9FeO3 sandwiched capacitors

R. L. Gao, Y. S. Chen, J. R. Sun, Y. G. Zhao, J. B. Li, and B. G. Shen

Appl. Phys. Lett. 101, 152901 (2012); http://dx.doi.org/10.1063/1.4757987 (5 pages) | Cited 1 time

Online Publication Date: 8 October 2012

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Polarization-modulated resistive switching and fatigue behaviors of the Ag/La0.1Bi0.9FeO3/La0.7Sr0.3MnO3 capacitors have been investigated. The device resistance is found to show a V-shaped dependence on poling voltage, and the lowest resistance appears at the voltage corresponding to the coercive field of La0.1Bi0.9FeO3. Based on this relation, three distinct resistance states can be achieved by applying appropriate pulse trains, which manifests a potential application in high-density storage technology. The fatigue properties of the sample under repeated bipolar or unipolar pulses were further analyzed. Bipolar pulses enhance the rectifying characters of the current-voltage relation, whereas unipolar pulses produce a reverse effect. Based on impedance analysis, we propose the formation of leakage paths along conductive domain walls, and it is the domain reconstruction during repeated polarization flipping that results in the complex transport behavior observed.
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84.32.Tt Capacitors
62.20.me Fatigue
77.80.Dj Domain structure; hysteresis
81.40.Np Fatigue, corrosion fatigue, embrittlement, cracking, fracture, and failure

Resonances in ferroelectric phononic superlattice

Igor Ostrovskii and Lucien Cremaldi

Appl. Phys. Lett. 101, 152902 (2012); http://dx.doi.org/10.1063/1.4757989 (4 pages)

Online Publication Date: 8 October 2012

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The periodically poled ferroelectric wafer is a two-dimensional phononic superlattice. The important applications of such a solid include ultrasonic transducers at the micro/nano-scale for low intensity ultra-sonography, ferroelectric data storage, and development of very high frequency chips for next generation communication and information technologies, and others. In this work, we show theoretically and experimentally that a ferroelectric phononic superlattice has two distinctive resonances in acousto-electric transformation. They are associated with a split acoustic mode at the boundary between the first and second acoustic Brillouin zone.
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63.20.D- Phonon states and bands, normal modes, and phonon dispersion
72.50.+b Acoustoelectric effects
77.80.Dj Domain structure; hysteresis

Roles of Schottky barrier and oxygen vacancies in the electroforming of SrTiO3

Xin Guo

Appl. Phys. Lett. 101, 152903 (2012); http://dx.doi.org/10.1063/1.4759030 (4 pages) | Cited 1 time

Online Publication Date: 10 October 2012

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Single crystalline SrTiO3 was used as a model system to evaluate the roles of the Schottky barrier and oxygen vacancies in electroforming. An advantage of single crystalline SrTiO3 is that the electrochemical processes at intermediate temperatures have been thoroughly investigated. To take this advantage, the electroforming was performed at 200 °C and subsequently at 24 °C; an electrical stress of 4 × 103 V/cm, which was about two orders of magnitude lower than the electrical stress in previous works, decreased the cell resistance by orders of magnitude. After the electroforming, bipolar resistive switching was realized at 24 °C.
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73.30.+y Surface double layers, Schottky barriers, and work functions
61.72.jd Vacancies
82.45.-h Electrochemistry and electrophoresis

Significant enhancement in energy density of polymer composites induced by dopamine-modified Ba0.6Sr0.4TiO3 nanofibers

Yu Song, Yang Shen, Penghao Hu, Yuanhua Lin, Ming Li, and C. W. Nan

Appl. Phys. Lett. 101, 152904 (2012); http://dx.doi.org/10.1063/1.4760228 (3 pages)

Online Publication Date: 11 October 2012

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Ba0.6Sr0.4TiO3 (BST) nanofibers prepared via electrospinning and modified by dopamine are used as dielectric fillers in polyvinylidene fluoride (PVDF)-based composites. With 4.4 vol. % of BST nanofibers, the extractable energy density of the BST/PVDF composites is more than doubled as compared with pure PVDF matrix. Such significant enhancement is attributed to the combined effect of both surface modification by dopamine and large aspect ratio of the BST nanofibers. Paraelectric or anti-ferroelectric fillers of large aspect ratio may serve as a general strategy for enhanced electric energy density in polymer composites.
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81.16.-c Methods of micro- and nanofabrication and processing
77.84.Lf Composite materials
77.80.-e Ferroelectricity and antiferroelectricity
61.46.-w Structure of nanoscale materials

Magnetic field-dependent effective microwave properties of microwire-epoxy composites

F. X. Qin, H. X. Peng, J. Fuller, and C. Brosseau

Appl. Phys. Lett. 101, 152905 (2012); http://dx.doi.org/10.1063/1.4758483 (5 pages) | Cited 1 time

Online Publication Date: 11 October 2012

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In this work, we report on the observation of the electromagnetic parameters of glass-covered amorphous microwires/epoxy composites with various concentrations of microwires over a broad magnetic field range up to 1 kOe. The effective permittivity presents a strong tunability with respect to a dc magnetic field excitation. An inherent crossover field due to the microwires is further observed at 300 Oe suggesting that the giant magnetoimpedance effect dominates the features of dipolar absorption at low magnetic field bias (<300 Oe), while the opposite behavior is expected at larger dc magnetic field excitations. This crossover field is found to be insensitive to changes in the microwire content.
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75.47.De Giant magnetoresistance
72.20.My Galvanomagnetic and other magnetotransport effects
77.22.Ch Permittivity (dielectric function)

Crystal structure of 0.96(Na0.5Bi0.5TiO3)–0.04(BaTiO3) from combined refinement of x-ray and neutron diffraction patterns

T.-M. Usher, J. S. Forrester, C. R. dela Cruz, and J. L. Jones

Appl. Phys. Lett. 101, 152906 (2012); http://dx.doi.org/10.1063/1.4759117 (4 pages)

Online Publication Date: 12 October 2012

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High-resolution x-ray and neutron diffraction of (0.96)Na0.5Bi0.5TiO3–(0.04)BaTiO3 (NBT-4BT) reveal subtle structural distortions that evidence lower symmetry than allowed in the R3c space group. The combined refinement that best models the diffraction patterns is a two phase mixture of a monoclinic Cc phase and a minor fraction of a metrically cubic Pmmathm phase (13 wt. %). The cubic phase is utilized to account for nanometer-scale regions whose local deviations from the long-range symmetry are not observed, such as polar nano-regions or tetragonal platelets. This suggests that the low symmetry found in the NBT-rich phases extends from 0 at. % to at least 4 at. % BT.
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61.66.Fn Inorganic compounds
81.30.Bx Phase diagrams of metals, alloys, and oxides
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