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3 Nov 2003

Volume 83, Issue 18, pp. 3647-3835

Issue Cover Spotlight Figure

Appl. Phys. Lett. 83, 3737 (2003); http://dx.doi.org/10.1063/1.1623315 (3 pages)

Ian Appelbaum, D. J. Monsma, K. J. Russell, V. Narayanamurti, and C. M. Marcus
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First-order reversal curves diagrams for the characterization of ferroelectric switching

Alexandru Stancu, Dan Ricinschi, Liliana Mitoseriu, Petronel Postolache, and Masanori Okuyama

Appl. Phys. Lett. 83, 3767 (2003); http://dx.doi.org/10.1063/1.1623937 (3 pages) | Cited 21 times

Online Publication Date: 28 October 2003

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A method to describe the switching characteristics of the ferroelectrics is proposed, using the first-order reversal curve (FORC) diagrams. On these diagrams, the reversible and irreversible contributions to the ferroelectric polarization can be clearly separated. They are extremely sensitive to the changes of the hysteresis loops induced by degradation of the ferroelectric polarization, such as fatigue. Sharp in the fresh state, the FORC distribution becomes wide with its maximum shifted towards higher fields after 109 switching cycles. A strong increase of the reversible component was found in the fatigue state. With appropriate interpretation, these diagrams could be valuable as “fingerprints” of the switching characteristics of the ferroelectric systems in a particular state. © 2003 American Institute of Physics.
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77.80.Fm Switching phenomena
77.22.Ej Polarization and depolarization
77.80.Dj Domain structure; hysteresis

Well-ordered arrays of pyramid-shaped ferroelectric BaTiO3 nanostructures

Wenhui Ma, Catalin Harnagea, Dietrich Hesse, and Ulrich Gösele

Appl. Phys. Lett. 83, 3770 (2003); http://dx.doi.org/10.1063/1.1625106 (3 pages) | Cited 35 times

Online Publication Date: 28 October 2003

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Monolayers of monodisperse latex spheres of micron size were used as deposition masks to fabricate arrays of ferroelectric nanostructures by pulsed laser deposition using a BaTiO3 target. First, arrays of well-ordered structures were prepared on SrTiO3:Nb (100) single-crystal substrates at room temperature. Investigations of these isolated as-deposited nanostructures by atomic force microscopy revealed that they have a pyramid-like shape with about 200 nm lateral size at half their height and form a regular hexagonal pattern. Then postdeposition annealing was used to crystallize the nanostructures. The ferroelectric properties of the crystalline structures were investigated by scanning force microscopy in piezoresponse mode. Piezoelectric hysteresis loops were recorded, demonstrating that the barium titanate nanopyramids have a remanent polarization and are switchable by an electric field, i.e., they are indeed ferroelectric. © 2003 American Institute of Physics.
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77.80.Dj Domain structure; hysteresis
61.46.-w Structure of nanoscale materials
77.84.Ek Niobates and tantalates
77.84.Cg PZT ceramics and other titanates
81.16.Mk Laser-assisted deposition
81.15.Fg Pulsed laser ablation deposition
61.72.Cc Kinetics of defect formation and annealing
77.65.Bn Piezoelectric and electrostrictive constants
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