APL: Dielectrics and Ferroelectricity http://scitation.aip.org/ APL: Dielectrics and Ferroelectricity Interaction of LaO capping layers with HfO gate dielectrics http://link.aip.org/link/?APL/95/212903/1&agg=rss M. Copel, S. Guha, N. Bojarczuk, E. Cartier, V. Narayanan et al.<br/> We report the effect of LaO capping layers on HfO/SiO/Si dielectrics, proposed for use in threshold voltage tuning of field effect transistors. Depth profiling with medium energy ion scattering shows that an initial surface layer of LaO diffuses through the HfO at elevated temperatures, ultimately c ... [Appl. Phys. Lett. 95, 212903 (2009)] published Tue Nov 24, 2009. Characterization of the clean-up of the oxidized Ge(100) surface by atomic layer deposition http://link.aip.org/link/?APL/95/212902/1&agg=rss M. Milojevic, R. Contreras-Guerrero, M. Lopez-Lopez, J. Kim, and R. M. Wallace<br/> While the clean-up effect on III-V substrates has recently been well documented interfacial reactions during atomic layer deposition (ALD) on Ge substrates are not fully explored. The clean-up of Ge oxides is studied by interrupting the ALD process following individual precursor pulses for in situ m ... [Appl. Phys. Lett. 95, 212902 (2009)] published Tue Nov 24, 2009. Epitaxial growth of (001)-oriented BaSrTiO thin films on a-plane sapphire with an MgO/ZnO bridge layer http://link.aip.org/link/?APL/95/212901/1&agg=rss Bo Xiao, Hongrui Liu, Vitaliy Avrutin, Jacob H. Leach, Emmanuel Rowe et al.<br/> High quality (001)-oriented BaSrTiO (BST) thin films have been grown on a-plane sapphire (11[overline 2]0) by rf magnetron sputtering using a double bridge layer consisting of (0001)-oriented ZnO (50 nm) and (001)-oriented MgO (10 nm) prepared by plasma-assisted molecular beam epitaxy. X-ray diffrac ... [Appl. Phys. Lett. 95, 212901 (2009)] published Mon Nov 23, 2009. Surface functionalized BaSrTiO /poly(vinylidene fluoride) nanocomposites with significantly enhanced dielectric properties http://link.aip.org/link/?APL/95/202904/1&agg=rss Kecheng Li, Hong Wang, Feng Xiang, Weihong Liu, and Haibo Yang<br/> A nanocomposite was prepared by embedding BaSrTiO (BST)/silver core/shell nanoparticles (BST@Ag) into polyvinylidene-fluoride (PVDF). Through functionalizing the surface of BST nanoparticles by silver coating, the relative permittivity of composites was significantly increased to 153 at 100 Hz which ... [Appl. Phys. Lett. 95, 202904 (2009)] published Fri Nov 20, 2009. Synergistic information encoding by combinatorial pulse operation of ferroelectrics http://link.aip.org/link/?APL/95/202905/1&agg=rss Dan Ricinschi, Damian Nicastro, Takeshi Kanashima, and Masanori Okuyama<br/> We explore beyond binary memory capability of ferroelectrics, aiming to render them able to encode multiple bit information, based on operation in a regime spanning several polarization reversal mechanisms. Accessing a Pb(Zr,Ti)O ceramic capacitor with combinatorial sequences of pulses whose amplitu ... [Appl. Phys. Lett. 95, 202905 (2009)] published Fri Nov 20, 2009. Visualization of highly graded oxygen vacancy profiles in lead-zirconate-titanate by spectrally resolved cathodoluminescence spectroscopy http://link.aip.org/link/?APL/95/202903/1&agg=rss Atsuo Matsutani, Zhenhua (Jerry) Luo, Soodkhet Pojprapai, Mark Hoffman, and Giuseppe Pezzotti<br/> The ultraviolet and visible cathodoluminescence (CL) emitted at room temperature from bulk hard lead-zirconate-titanate polycrystalline perovskite has been systematically collected before and after an annealing cycle conducted in a reducing atmosphere. Spectroscopic assessments have been made of the ... [Appl. Phys. Lett. 95, 202903 (2009)] published Wed Nov 18, 2009. Sol-gel derived ferroelectric nanoparticles investigated by piezoresponse force microscopy http://link.aip.org/link/?APL/95/202901/1&agg=rss F. Johann, T. Jungk, S. Lisinski, A. Hoffmann, L. Ratke et al.<br/> Piezoresponse force microscopy (PFM) was used to investigate the ferroelectric properties of sol-gel derived LiNbO nanoparticles. To determine the degree of ferroelectricity we took large-area images and performed statistical image-analysis. The ferroelectric behavior of single nanoparticles was ver ... [Appl. Phys. Lett. 95, 202901 (2009)] published Mon Nov 16, 2009. Evolution of 180 degrees , 90 degrees , and vortex domains in ferroelectric films http://link.aip.org/link/?APL/95/192905/1&agg=rss Manas Kumar Roy, Shamik Sarkar, and Sushanta Dattagupta<br/> A Landau-like theory of phase transition and its time-dependent generalization are shown to be sufficient for describing the formation and kinetics of 180 degrees , 90 degrees , and vortex (toroidal) domains in ferroelectric thin films. The theory relies only on the choice of boundary conditions and ... [Appl. Phys. Lett. 95, 192905 (2009)] published Fri Nov 13, 2009. Large-strain, rigid-to-rigid deformation of bistable electroactive polymers http://link.aip.org/link/?APL/95/192904/1&agg=rss Zhibin Yu, Wei Yuan, Paul Brochu, Bin Chen, Zhitian Liu et al.<br/> Thermoplastic poly(tert-butyl acrylate) (PTBA) is reported as an electroactive polymer that is rigid at ambient conditions and turns into a dielectric elastomer above a transition temperature. In the rubbery state, a PTBA thin film can be electrically actuated to strains up to 335% in area expansion ... [Appl. Phys. Lett. 95, 192904 (2009)] published Thu Nov 12, 2009. Dielectric, ferroelectric, and pyroelectric characterization of Mn-doped 0.74Pb(MgNb)O0.26PbTiO crystals for infrared detection applications http://link.aip.org/link/?APL/95/192903/1&agg=rss Linhua Liu, Xiaobing Li, Xiao Wu, Yaojin Wang, Wenning Di et al.<br/> We investigated the dielectric, ferroelectric, and pyroelectric properties of Mn-doped 0.74Pb(MgNb)O0.26PbTiO crystals. Compared with pure PMN-0.26PT, Mn substitutions resulted in reduced dielectric loss and enhanced coercive field. Furthermore, the pyroelectric coefficient and detectivity figures o ... [Appl. Phys. Lett. 95, 192903 (2009)] published Wed Nov 11, 2009. Locating La atoms in epitaxial BiLaTiO films through atomic resolution electron energy loss spectroscopy mapping http://link.aip.org/link/?APL/95/192902/1&agg=rss L. Gunawan, S. Lazar, O. Gautreau, C. Harnagea, A. Pignolet et al.<br/> Atomic resolution high-angle annular dark-field imaging of La-doped bismuth titanate (BLT), BiLaTiO, has been carried out with an aberration-corrected transmission electron microscope. The HAADF image revealed the presence of defects in the [BiO] layers and extra atomic rows between the [BiO] layers ... [Appl. Phys. Lett. 95, 192902 (2009)] published Mon Nov 9, 2009. Electrical behavior and oxygen vacancies in BiFeO/[(BiNa)Ba]TiO thin film http://link.aip.org/link/?APL/95/192901/1&agg=rss Jiagang Wu, Guangqing Kang, and John Wang<br/> Multiferroic bilayered thin films consisting of [(BiNa)Ba]TiO (BNBT) and BiFeO (BFO) nanolayers were successfully grown on Pt/TiO/SiO/Si substrates via a combined sol-gel and radio frequency sputtering route. The bilayered BFO/BNBT thin film with (110) orientation and dense texture exhibits excellen ... [Appl. Phys. Lett. 95, 192901 (2009)] published Mon Nov 9, 2009. Investigation of the electrocaloric effect in a PbMgNbO-PbTiO relaxor thin film http://link.aip.org/link/?APL/95/182904/1&agg=rss T. M. Correia, J. S. Young, R. W. Whatmore, J. F. Scott, N. D. Mathur et al.<br/> Permittivity measurements of a 0.93PMN-0.07PT thin film show a broad maximum near 35 degrees C, and an anomaly at the depolarizing temperature T=18 degrees C on heating only, suggesting a dipolar glass-relaxor phase transition. No structural phase transition at 18 degrees C is apparent from ferro ... [Appl. Phys. Lett. 95, 182904 (2009)] published Fri Nov 6, 2009. Study on dielectric and magnetodielectric properties of LuFeO ceramics http://link.aip.org/link/?APL/95/182903/1&agg=rss Xiaobo Wu, Xiaofei Wang, Yunfei Liu, Wei Cai, Song Peng et al.<br/> Polycrystalline LuFeO ceramics with garnet structure were prepared by a solid-state reaction method. A dielectric relaxor behavior at low temperature was observed which may come from the dipolar effects associated with the charge carrier hopping between Fe and Fe. It is noticeable that their magneto ... [Appl. Phys. Lett. 95, 182903 (2009)] published Thu Nov 5, 2009. Composition-dependent dielectric properties of RbTiOPO single crystals http://link.aip.org/link/?APL/95/182902/1&agg=rss Jna. Gavalda, J. J. Carvajal, X. Mateos, M. Aguilo, and F. Diaz<br/> We measured the ionic conductivity for two single crystals of RbTiOPO grown in self-fluxes with different chemical composition. Ionic conductivity depended on the composition of the self-flux solution in which the crystal was grown. One of the samples showed an anisotropic behavior along the three c ... [Appl. Phys. Lett. 95, 182902 (2009)] published Tue Nov 3, 2009. Spontaneous buildup of surface potential with a thin film of a zwitterionic molecule giving noncentrosymmetric crystal structure http://link.aip.org/link/?APL/95/182901/1&agg=rss Jun'ya Tsutsumi, Hiroyuki Yoshida, Richard Murdey, and Naoki Sato<br/> Surface potentials were examined using the Kelvin method for thin films of zwitterionic molecules, pyridinium 1,3-dihydro-1,3-dioxo-2H-inden-2-ylide (PI or IPB) and two nitrogen-substituted derivatives. Spontaneous buildup of the surface potential on the film (5.5 V at a film thickness of 300 nm) wa ... [Appl. Phys. Lett. 95, 182901 (2009)] published Tue Nov 3, 2009. Transparent and flexible polymerized graphite oxide thin film with frequency-dependent dielectric constant http://link.aip.org/link/?APL/95/172901/1&agg=rss D. W. Lee, J. W. Seo, G. R. Jelbert, L. de Los Santos, V., J. M. Cole et al.<br/> Here we report on the preparation of transparent and flexible polymerized graphite oxide, which is composed of carbons with sp-hybridized orbitals and a nonplanar ring structure, and which demonstrates dispersion in its dielectric constant at room temperature. This frequency dependence renders the m ... [Appl. Phys. Lett. 95, 172901 (2009)] published Mon Oct 26, 2009. Influence of dc-bias on phase stability in Mn-doped NaBiTiO-5.6 at. %BaTiO single crystals http://link.aip.org/link/?APL/95/162903/1&agg=rss Wenwei Ge, Hu Cao, Jiefang Li, D. Viehland, Qinhui Zhang et al.<br/> Mn-doped NaBiTiO-5.6 at. %BaTiO (Mn:NBT-5.6%BT) single crystals were grown by a top-seeded solution growth method. Tetragonal and rhombohedral phases were found to coexist in the as-grown condition. The dielectric and structural properties were studied as a function of temperature under dc electric ... [Appl. Phys. Lett. 95, 162903 (2009)] published Tue Oct 20, 2009. Growth and properties of chemical solution deposited BiInOPbTiO films http://link.aip.org/link/?APL/95/162901/1&agg=rss S. W. Ko, H. G. Yeo, and S. Trolier-McKinstry<br/> The dielectric, ferroelectric, and piezoelectric properties of chemical solution deposited xBiInO(1x)PbTiO (0.10<=x<=0.35) thin films on platinized silicon substrates were investigated. Using a PbTiO seed layer, phase pure xBiInO(1x)PbTiO (0.10<=x<=0.35) thin films were prepared. For a 470 nm thick ... [Appl. Phys. Lett. 95, 162901 (2009)] published Mon Oct 19, 2009. Reliability properties of metal-oxide-semiconductor capacitors using LaAlO high-k dielectric http://link.aip.org/link/?APL/95/162902/1&agg=rss Lingyen Yeh, Ingram Yin-Ku Chang, Chun-Heng Chen, and Joseph Ya-Min Lee<br/> In this study, metal-oxide-semiconductor (MOS) capacitors with high dielectric constant LaAlO film were fabricated. Furthermore, the characteristic time-to-breakdown, T, of the MOS capacitors was investigated. The T was measured and the corresponding Weibull slopes, beta, of the MOS capacitors with ... [Appl. Phys. Lett. 95, 162902 (2009)] published Mon Oct 19, 2009. Giant room-temperature magnetocapacitance in Co doped SnO dielectric films http://link.aip.org/link/?APL/95/152901/1&agg=rss Jian-guo Wan, Qi Lu, Bo Chen, Fengqi Song, Jun-ming Liu et al.<br/> The giant room-temperature magnetocapacitance is reported in the Co substitutionally doped SnO film in which the ferromagnetism coexists with the dielectric state. The maximum magnetocapacitance is observed in the SnCoO film in which the magnetocapacitance is as large as 0.45 at frequency of 1.0 kHz ... [Appl. Phys. Lett. 95, 152901 (2009)] published Wed Oct 14, 2009.