Influence of fatigue processes on the switching currents in lead titanate and lead zirconate-titanate films

Сидоркин, А. С.; Nesterenko, L. P.; Pakhomov, A. Yu.

doi:10.1134/s1063783412050368

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…Recently, a revived interest has arisen in defect related phenomena in ferroelectric structures including domain wall dynamics and their interaction with defects and charges, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] driven by the demand for sustained functionality in reduced dimensions. Surfaces can also be treated as a type of defect where the crystal periodicity terminates, sometimes along with a local field.…”

Section: Introductionmentioning

confidence: 99%

Very large dielectric response from ferroelectric nanocapacitor films due to collective surface and strain relaxation effects

Misirlioglu

Yıldız

2013

Journal of Applied Physics

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Dependence of the dielectric response of ferroelectrics on defect types, particularly those with long range strain fields in confined geometries have been often mentioned, especially in interpreting experimental results in films. However, detailed discussions on the mechanisms with which defects alter properties, particularly in the presence of interfaces imposing certain boundary conditions, are seldom made. Here, we studied the thickness dependence of transition temperatures and dielectric response of Metal/BaTiO3/Metal ferroelectric nanocapacitor structures grown on SrTiO3 using a phenomenological approach accounting for the equations of electrostatics and semiconductors. Relaxation of the misfit strain via misfit dislocations amplify the surface effects in films below a critical thickness and favor electrical domains leading to very large dielectric responses in this regime. Thin film structures with relaxed misfit strain in this work are fully depleted in the presence of moderate densities of impurities ( $ 10 25 m À3 ). This is due to the reduction of polarization amplitude parallel to the film normal and its mplications for near-micron thick films are discussed. Consequently, the misfit dislocation sites have nearly no free carrier localization, making the role of these sites on leakage currents highly questionable. Dielectric response of intrinsic thicker films ( > 40 nm) is mostly under the influence of strain relaxation only with minimal interface impact in the limit of ideal electrodes. Our results point out that control of the dislocation density can lead to non-conventional functionalities in ferroelectric thin film capacitors via electromechanical coupling of properties to structure and domain stabilization. V C 2013 AIP Publishing LLC.

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Section: Introductionmentioning

confidence: 99%

Very large dielectric response from ferroelectric nanocapacitor films due to collective surface and strain relaxation effects

Misirlioglu

Yıldız

2013

Journal of Applied Physics

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“…Among these phenomena, of particular interest is so called polar ization fatigue, which has been intensively studied in recent years by many authors [1][2][3][4][5][6]. The patterns of polarization fatigue as the dependence of the critical number of switching cycles that the sample undergoes on the amplitude of the field driving the switching and its frequency and temperature show that, at least, in the case of lead titanate and zirconate-titanate, the observed processes of polarization fatigue have a domain nature [7][8][9]. The domain structure thus can play either an active or a passive role: in the first case, the basic parameters of the switching process change; in the latter, switching is simply blocked by extraneous factors.…”

Section: Introductionmentioning

confidence: 99%