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2 Jan 2006

Volume 88, Issue 1, Articles (01xxxx)

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Appl. Phys. Lett. 88, 011112 (2006); http://dx.doi.org/10.1063/1.2161387 (3 pages)

Yoshinori Tanaka, Takashi Asano, Ranko Hatsuta, and Susumu Noda
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Low-temperature synthesis of (Pb,La)(Zr,Ti)O3 thick film on Ti substrates by the hydrothermal method using oxide precursors

Xiuli Chen, Huiqing Fan, and Shanming Ke

Appl. Phys. Lett. 88, 012901 (2006); http://dx.doi.org/10.1063/1.2161119 (3 pages) | Cited 1 time

Online Publication Date: 4 January 2006

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We simplified the hydrothermal process using oxides instead of liquid-base reactants as precursors. Lead lanthanum zirconate titanate Pb0.94La0.06(Zr0.65Ti0.35)0.985O3 (PLZT) thick films were prepared on Ti substrates at 150 °C via hydrothermal synthesis. The films with a single perovskite structure were smooth and the surfaces were free of micrometer scale cracks. The thickness of the film was about 56 μm. The dielectric constant and dielectric loss were 665 and 0.03, respectively, at 1 MHz. Even at high frequencies the dielectric properties of the PLZT film still remain stable. The samples showed excellent reproducibility in the measurement of leakage current.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.55.-g Dielectric thin films
77.65.-j Piezoelectricity and electromechanical effects
81.15.Lm Liquid phase epitaxy; deposition from liquid phases (melts, solutions, and surface layers on liquids)
77.22.Ch Permittivity (dielectric function)
77.22.Gm Dielectric loss and relaxation

Directionally dependent ferroelectric phase transition order of anisotropic epitaxial BaxSr1−xTiO3 thin films

Jeffrey A. Bellotti, Wontae Chang, Syed B. Qadri, Steven W. Kirchoefer, and Jeffrey M. Pond

Appl. Phys. Lett. 88, 012902 (2006); http://dx.doi.org/10.1063/1.2161937 (3 pages) | Cited 19 times

Online Publication Date: 5 January 2006

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Epitaxial Ba0.5Sr0.5TiO3 thin films were grown by pulsed-laser deposition on (100) LaAlO3 substrates in two distinct strain states, c/a>1 and c/a<1. X-ray diffraction measurements over the temperature range of 20 °C to −120 °C showed that the change in the c/a ratio with decreasing temperature was discontinuous and positive for the film with c/a>1, and continuous and negative for the film with c/a<1. These symmetry changes in the c/a ratio with temperature were correlated with measurements of the in-plane dielectric properties, and showed that the polarization in these two types of structures has characteristically different behavior that is highly directionally-dependent.
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77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.80.B- Phase transitions and Curie point
77.55.-g Dielectric thin films
77.22.Ej Polarization and depolarization

Effect of ferroelectric layers on the magnetocapacitance properties of superlattices-based oxide multiferroics

M. P. Singh, W. Prellier, L. Mechin, and B. Raveau

Appl. Phys. Lett. 88, 012903 (2006); http://dx.doi.org/10.1063/1.2159094 (3 pages) | Cited 17 times

Online Publication Date: 6 January 2006

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A series of superlattices composed of ferromagnetic La0.7Ca0.3MnO3 (LCMO) and ferroelectric/paraelectric Ba1−xSrxTiO3 (0 ⩽ x ⩽ 1) were deposited on SrTiO3 substrates using pulsed laser deposition. Magnetotransport properties of the films reveal a ferromagnetic Curie temperature in the range of 145–158 K, and negative magnetoresistance as high as 30%, depending on the type of ferroelectric layers employed for their growth (i.e., “x” value). Ferroelectricity at temperatures ranging from 55 K to 105 K is also observed, depending on the barium content. More importantly, the multiferroic nature of the film is determined by the appearance of negative magnetocapacitance, which is maximum around the ferroelectric transition temperature (3% per tesla). These results are understood based on the role of the ferroelectric/paraelectric layers and strains in inducing the multiferroism.
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75.47.Gk Colossal magnetoresistance
77.55.-g Dielectric thin films
77.80.B- Phase transitions and Curie point
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
75.50.Dd Nonmetallic ferromagnetic materials
81.15.Fg Pulsed laser ablation deposition
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