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8 Dec 2008

Volume 93, Issue 23, Articles (23xxxx)

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Appl. Phys. Lett. 93, 231101 (2008); http://dx.doi.org/10.1063/1.3040686 (3 pages)

Mads Brøkner Christiansen, Anders Kristensen, Sanshui Xiao, and Niels Asger Mortensen
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Phase-specific magnetic ordering in BiFeO3−PbTiO3

Tim P. Comyn, Tim Stevenson, Maisoon Al-Jawad, Stuart L. Turner, Ronald I. Smith, William G. Marshall, Andrew J. Bell, and Robert Cywinski

Appl. Phys. Lett. 93, 232901 (2008); http://dx.doi.org/10.1063/1.3042209 (3 pages) | Cited 3 times

Online Publication Date: 9 December 2008

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The multiferroic 0.7 BiFeO3–0.3 PbTiO3 has been fabricated in both sintered ceramic and powder form using conventional mixed oxide synthesis. Rietveld’s analysis of neutron powder diffraction data has shown that the sintered ceramic and powder are predominantly R3c and P4mm phases, respectively. It is shown explicitly that magnetic ordering does not occur for the P4mm phase at room temperature.
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75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
75.30.Cr Saturation moments and magnetic susceptibilities
75.50.Tt Fine-particle systems; nanocrystalline materials
61.43.Gt Powders, porous materials
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Glasslike state in PbFe1/2Nb1/2O3 single crystal

Ashok Kumar, R. S. Katiyar, Carlos Rinaldi, Sergey G. Lushnikov, and Tatjana A. Shaplygina

Appl. Phys. Lett. 93, 232902 (2008); http://dx.doi.org/10.1063/1.3043686 (3 pages) | Cited 7 times

Online Publication Date: 9 December 2008

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Magnetic properties of PbFe1/2Nb1/2O3 single crystal showed onset of glasslike behavior at 120 K, saturation of onset at 28 K, and freezing of glasslike state at 27.6 K. Zero field cooled (ZFC) and field cooled magnetization curves displayed sharp cusp in ZFC. Almeida and Toulouse line illustrated stability over 1000 Oe with unstable onset for low field. Magnetic hysteresis was observed below glasslike freezing temperature having steplike behavior and low coercive field ∼ 296 Oe, which may be due to chemical inhomogeneity, strong anisotropy, and weak dipole interaction.
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75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Lk Spin glasses and other random magnets
75.70.-i Magnetic properties of thin films, surfaces, and interfaces
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
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Transmission electron microscopic study of the long period modulated phase in the morphotropic phase-boundary region of (1−x)NaNbO3–xCaTiO3 for x = 0.16

Saurabh Tripathi, N. P. Lalla, and Dhananjai Pandey

Appl. Phys. Lett. 93, 232903 (2008); http://dx.doi.org/10.1063/1.3037223 (3 pages)

Online Publication Date: 10 December 2008

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The recently reported structure of the long period modulated phase of (1−x)NaNbO3–xCaTiO3, with x = 0.16, has been revisited using transmission electron microscopic studies. It is shown that the dominant phase in the morphotropic phase boundary region of this mixed system is incommensurately modulated in the [001] direction with an approximate unit cell size of 2ap×2ap×24ap, where ap is the pseudoperovskite cell parameter.
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61.66.Fn Inorganic compounds
61.50.Ah Theory of crystal structure, crystal symmetry; calculations and modeling
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
77.80.-e Ferroelectricity and antiferroelectricity
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Misfit strain–misfit strain diagram of epitaxial BaTiO3 thin films: Thermodynamic calculations and phase-field simulations

G. Sheng, J. X. Zhang, Y. L. Li, S. Choudhury, Q. X. Jia, Z. K. Liu, and L. Q. Chen

Appl. Phys. Lett. 93, 232904 (2008); http://dx.doi.org/10.1063/1.3039410 (3 pages) | Cited 8 times

Online Publication Date: 11 December 2008

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The effect of anisotropic strains on the phase transitions and domains structures of BaTiO3 thin films was studied using both thermodynamic calculations and phase-field simulations. The misfit strain–misfit strain domain stability diagrams were predicted. The similarity and significant differences between the diagrams from thermodynamic calculations assuming single domains and from phase-field simulations were analyzed. Typical domain structures as a result of anisotropic misfit strains are presented.
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77.55.-g Dielectric thin films
77.80.B- Phase transitions and Curie point
77.80.Dj Domain structure; hysteresis
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Dielectric properties of Ba0.5Sr0.5TiO3/SiN bilayered thin films grown on Pt-coated sapphire substrates

Niandeng Xiong, Shuwen Jiang, Yanrong Li, Lefan Tan, and Ruguan Li

Appl. Phys. Lett. 93, 232905 (2008); http://dx.doi.org/10.1063/1.3049127 (3 pages) | Cited 7 times

Online Publication Date: 12 December 2008

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The Ba0.5Sr0.5TiO3(BST)/SiN bilayered thin films with a SiN layer serving as a buffer layer between the top electrode and the BST layer have been prepared onto Pt-coated c-plane sapphire substrates. The dielectric measurements show that the loss tangent has been significantly lowered. The dielectric properties of the BST/SiN bilayered thin films are strongly dependent on the SiN thickness. The BST/SiN bilayered thin films at a SiN/BST thickness ratio of 0.2 give the largest figure of merit of 50.1. The thickness effect was discussed as well with a series connection model of multilayered capacitors, and the favorable simulation was obtained.
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84.32.Tt Capacitors
85.40.-e Microelectronics: LSI, VLSI, ULSI; integrated circuit fabrication technology
77.55.-g Dielectric thin films
77.22.Gm Dielectric loss and relaxation
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