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19 Dec 2011

Volume 99, Issue 25, Articles (25xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 99, 253701 (2011); http://dx.doi.org/10.1063/1.3666819 (3 pages)

Jun Huang, Hui Li, Wei Chen, Guo-Hua Lv, Xing-Quan Wang, Guo-Ping Zhang, Kostya Ostrikov, Peng-Ye Wang, and Si-Ze Yang
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Anomalous elastic behavior of relaxor ferroelectric Ca0.28Ba0.72Nb2O6:Ce studied by resonant ultrasound spectroscopy

Chandra Shekhar Pandey, Jürgen Schreuer, Manfred Burianek, and Manfred Mühlberg

Appl. Phys. Lett. 99, 252901 (2011); http://dx.doi.org/10.1063/1.3670323 (3 pages) | Cited 3 times

Online Publication Date: 19 December 2011

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Elastic behavior of tetragonal tungsten bronze uniaxial relaxor ferroelectric cerium doped Ca0.28Ba0.72Nb2O6 single crystal was investigated employing resonant ultrasound spectroscopy in the temperature range from room temperature up to 1323 K. Doping of cerium lowers the phase transition temperature Tc and Burns temperature Tb significantly, however, intermediate characteristic temperature T* (between the Burns temperature Tb and the temperature of maximum dielectric permittivity Tm) remains same as for pure Ca0.28Ba0.72Nb2O6. All independent elastic constants evolved differently with temperature, reflecting their coupling to different types of the reorientational motion of the polar nanoregions through their interaction with the acoustic waves.
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81.40.Jj Elasticity and anelasticity, stress-strain relations
62.20.dq Other elastic constants
77.80.Jk Relaxor ferroelectrics
65.40.De Thermal expansion; thermomechanical effects
77.84.Ek Niobates and tantalates
77.22.Ch Permittivity (dielectric function)

In situ microwave characterization of microwire composites under mechanical stress

Faxiang Qin, C. Brosseau, and H. X. Peng

Appl. Phys. Lett. 99, 252902 (2011); http://dx.doi.org/10.1063/1.3668109 (4 pages) | Cited 5 times

Online Publication Date: 20 December 2011

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We present results of an experimental characterization of the dielectric properties and microwave absorption of rubber composite samples containing Fe4Co68.7Ni1B13Si11Mo2.3 amorphous microwires which are submitted to a low uniaxial tension. Measurements of the dielectric loss and microwave absorption as a function of strain over the frequency range of 300 MHz-6 GHz reveal that the uniaxial elongation randomly breaks wires at about 2.8% strain and this has for effect to decrease the loss factor for larger strain. Two possible mechanisms are identified to account for our observations, namely, the stress and shape effects. The ability to control this stretch breaking phenomenon will be instrumental to developing stress tunable microwire composites for sensing applications.
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81.40.Lm Deformation, plasticity, and creep
62.20.F- Deformation and plasticity
61.43.Fs Glasses
75.50.Kj Amorphous and quasicrystalline magnetic materials
77.22.Gm Dielectric loss and relaxation

Electrical creep induced ferroelectric domain wall motion in BaTiO3 single crystal

Q. D. Liu and J. E. Huber

Appl. Phys. Lett. 99, 252903 (2011); http://dx.doi.org/10.1063/1.3671327 (3 pages)

Online Publication Date: 21 December 2011

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Observations of 180° domain patterns were made on a bulk BaTiO3 single crystal using atomic force microscopy and piezoresponse force microscopy (PFM). Surface electrodes were then used to apply a weak in-plane electric field, and in-situ measurements of electrical creep induced domain structure evolution were made. The out-of-plane electric field component presented by electrodes was insufficient to cause significant switching alone. However, in the presence of the scanning PFM tip, a gradual change in 180° domain configuration was observed. This suggests that by combining in-plane fields with an out-of plane bias, domain configurations can be manipulated at the surface of bulk crystals using low voltages.
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77.80.Dj Domain structure; hysteresis

Misfit strain dependence of ferroelectric and piezoelectric properties of clamped (001) epitaxial Pb(Zr0.52,Ti0.48)O3 thin films

Minh D. Nguyen, Matthijn Dekkers, Evert Houwman, Ruud Steenwelle, Xin Wan, Andreas Roelofs, Thorsten Schmitz-Kempen, and Guus Rijnders

Appl. Phys. Lett. 99, 252904 (2011); http://dx.doi.org/10.1063/1.3669527 (4 pages) | Cited 8 times

Online Publication Date: 22 December 2011

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A study on the effects of the residual strain in Pb(Zr0.52Ti0.48)O3 (PZT) thin films on the ferroelectric and piezoelectric properties is presented. Epitaxial (001)-oriented PZT thin film capacitors are sandwiched between SrRuO3 electrodes. The thin film stacks are grown on different substrate-buffer-layer combinations by pulsed laser deposition. Compressive or tensile strain caused by the difference in thermal expansion of the PZT film and substrate influences the ferroelectric and piezoelectric properties. All the PZT stacks show ferroelectric and piezoelectric behavior that is consistent with the theoretical model for strained thin films in the ferroelectric r-phase. We conclude that clamped (001) oriented Pb(Zr0.52Ti0.48)O3 thin films strained by the substrate always show rotation of the polarization vector.
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84.32.Tt Capacitors
77.84.Cg PZT ceramics and other titanates
77.55.Px Epitaxial and superlattice films
77.22.Ej Polarization and depolarization
77.80.-e Ferroelectricity and antiferroelectricity
81.15.Fg Pulsed laser ablation deposition

Ferroelectric and electrical characterization of multiferroic BiFeO3 at the single nanoparticle level

R. K. Vasudevan, K. A. Bogle, A. Kumar, S. Jesse, R. Magaraggia, R. Stamps, S. B. Ogale, H. S. Potdar, and V. Nagarajan

Appl. Phys. Lett. 99, 252905 (2011); http://dx.doi.org/10.1063/1.3671392 (4 pages) | Cited 5 times

Online Publication Date: 22 December 2011

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Ferroelectric BiFeO3 (BFO) nanoparticles deposited on epitaxial substrates of SrRuO3 (SRO) and La1−xSrxMnO3 (LSMO) were studied using band excitation piezoresponse spectroscopy (BEPS), piezoresponse force microscopy (PFM), and ferromagnetic resonance (FMR). BEPS confirms that the nanoparticles are ferroelectric in nature. Switching behavior of nanoparticle clusters were studied and showed evidence for inhomogeneous switching. The dimensionality of domains within nanoparticles was found to be fractal in nature, with a dimensionality constant of ∼1.4, on par with ferroelectric BFO thin-films under 100 nm in thickness. Ferromagnetic resonance studies indicate BFO nanoparticles only weakly affect the magnetic response of LSMO.
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77.55.F- High-permittivity capacitive films
73.22.-f Electronic structure of nanoscale materials and related systems
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
77.80.-e Ferroelectricity and antiferroelectricity
77.84.-s Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials
77.55.Nv Multiferroic/magnetoelectric films
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