Investigating the effects of reduced size on the properties of ferroelectrics

Baxter, Paul N. W.; McAneney, J.; Lookman, A.; Sinnamon, L. J.; Evans, Paul; Schilling, A.; Adams, Timothy B.; Zhu, Xinhua; Pollard, Robert; Bowman, R. M.; Gregg, J. M.; Jung, Dong-Hoon; Morrison, Finlay D.; Scott, J. F.

doi:10.1109/tuffc.2006.168

Cited by 27 publications

(20 citation statements)

References 52 publications

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“…Our results support the works by Saad et al, by investigating thin-film single crystal materials who argued that the dielectric collapse in thinner ferroelectric films is neither a direct consequence of reduced size nor an outcome of unavoidable physics related to the ferroelectric-electrode boundary. 28,29 It has been conventionally supposed and recently confirmed both experimentally 30 32 where W d is depletion width, we would expect that an increase in Mn doping level will lead to progressively reduced W d , the appearance of an in-series capacitor structure (i.e., a partially depleted structure) and consequently size effects in the thin films.…”

Section: More Importantly Our Results Suggest That the Interfacial-lmentioning

confidence: 60%

Effect of manganese doping on the size effect of lead zirconate titanate thin films and the extrinsic nature of ‘dead layers’

Lou

Wang

2010

J. Phys.: Condens. Matter

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Abstract:We have investigated the size effect in lead zirconate titanate (PZT) thin films with a range of manganese (Mn) doping concentrations. We found that the size effect in the conventional Pt/PZT/Pt thin-film capacitors could be systematically reduced and almost completely eliminated by increasing Mn doping concentration. The interfacial layer at the electrode-film interface appears to disappear almost entirely for the PZT films with ~2% Mn doping levels, confirmed by the fits using the conventional "in-series capacitor" model. Our work indicates that the size effect in ferroelectrics is extrinsic in nature, supporting the work by Saad et al. Other implications of our results have also been discussed. By comparing a variety of experimental studies in the literature we propose a scenario that the "dead layer" between PZT (or barium strontium titanate, BST) and metal electrodes such as Pt and Au might have a defective pyrochlore/fluorite structure (possibly with a small portion of ferroelectric perovskite phase).

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Section: More Importantly Our Results Suggest That the Interfacial-lmentioning

confidence: 60%

Effect of manganese doping on the size effect of lead zirconate titanate thin films and the extrinsic nature of ‘dead layers’

Lou

Wang

2010

J. Phys.: Condens. Matter

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“…It immediately follows that, if one intends to get closer to the intrinsic value of the dielectric constant in ferroelectrics, it has to prepare single crystal or epitaxial samples with reduced density of structural defects 9 . Values well below 100 can be obtained in epitaxial films of reduced thickness 4,9,10 , and as low as 17 in a 12 nm thick (Ba,Sr)TiO 3 thin film 11 .…”

Section: Introductionmentioning

confidence: 95%

Low value for the static background dielectric constant in epitaxial PZT thin films

Boni

Chirilă

Hrib

et al. 2019

Sci Rep

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Ferroelectrics are intensively studied materials due to their unique properties with high potential for applications. Despite all efforts devoted to obtain the values of ferroelectric material constants, the problem of the magnitude of static dielectric constant remains unsolved. In this article it is shown that the value of the static dielectric constant at zero electric field and with negligible contribution from the ferroelectric polarization (also called static background dielectric constant, or just background dielectric constant) can be very low (between 10 and 15), possibly converging towards the value in the optical domain. It is also found that the natural state of an ideal, mono-domain, epitaxial ferroelectric is that of full depletion with constant capacitance at voltages outside the switching domain. The findings are based on experimental results obtained from a new custom method designed to measure the capacitance-voltage characteristic in static conditions, as well from Rayleigh analysis. These results have important implications in future analysis of conduction mechanisms in ferroelectrics and theoretical modeling of ferroelectric-based devices.

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“…There has been a trend in recent literature to use the term "size effect" relating to the stability of spontaneous polarization to specifically describe the manner in which reduced size leads to progressive collapse of ferroelectricity (Saad et al, 2006). Finding the point at which this size-driven phase transition occurs is obviously interesting and fundamentally important, and thus various groups have done excellent works to elucidate, via both theory (Li et al, 2996;Junquera & Ghosez, 2003) and experiment (Streiffer et al, 2002;Tybell et al, 1999;Nagarajan et al, 2004), the dimensions at which ferroelectricity is lost.…”

Section: Temperature-dependent Dielectric Anomalymentioning

confidence: 99%

Future Memory Technology and Ferroelectric Memory as an Ultimate Memory Solution

Kim¹,

Jung²

2011

Ferroelectrics - Applications

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Investigating the effects of reduced size on the properties of ferroelectrics

Cited by 27 publications

References 52 publications

Effect of manganese doping on the size effect of lead zirconate titanate thin films and the extrinsic nature of ‘dead layers’

Effect of manganese doping on the size effect of lead zirconate titanate thin films and the extrinsic nature of ‘dead layers’

Low value for the static background dielectric constant in epitaxial PZT thin films

Future Memory Technology and Ferroelectric Memory as an Ultimate Memory Solution

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