Stability of Vortex Phases in Ferroelectric Easy-Plane Nano-Cylinders

Lahoche, L.; Luk’yanchuk, I.; Pascoli, G.

doi:10.1080/10584580802107684

Cited by 44 publications

(40 citation statements)

References 10 publications

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“…The domain structure of the NW is visualized by color maps in red, green, and blue (RGB) for components P x , P y , and P z , respectively, as shown in Figure 2(a) (Ploting details are given in the Supplemental Material[26]), and the colored arrows represent the in-plane polarization distribution P x , P y corresponding to the vortex structures in Figure 2(a). Unlike the reported multi-vortex structures in nano-geometries confined in a two dimensional plane [17], the vortex (in the clockwise direction) and antivortex (counter clockwise direction) structures coexist along the axis of the R = 22.4 nm NW in the absence of an external electric field, but not in the same plane. Figure 2(b) shows the magnitude of the polarization in the NW.…”

Section: Resultsmentioning

confidence: 73%

“…The vortex-to-polarization phase transition in Pb(ZrTi)O 3 nanoparticles [16] was first predicted on the basis of abinitio calculations. Thereafter, vortex states with geometrical textures and critical temperatures were studied in two dimensional systems [17]. In ferroelectric nanowires (NWs), the vortex structure has also been inferred via first-principle calculations [18].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Energy Storage with Polar Vortices in Ferroelectric Nanocomposites

et al. 2017

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Nanocomposites of ferroelectric ceramic filler and polymer matrix show considerable promise as high energy storage dielectric capacitors. However, the influence of microstructure of the ferroelectric filler on the electric energy storage performance in the nanocomposite has not been quantitatively studied, yet it is a key element in understanding the methods employed to improve the performance of capacitors. We demonstrate an innovative strategy to enhance the energy storage density with topological vortex structures in nanocomposites. Using three dimensional phase field calculations, we show that multi-vortex structures can exist in ferroelectric nanowires without charge defects or free charges at the interface between the filler and matrix. The switching behavior of the topological structure (vortex and anti-vortex pair) under external electric field is calculated in nanocylinder wires. The small remnant polarization and very narrow hysteresis loop due to the vortex structure in the nanocomposites can lead to a large enhancement of energy density, as high as 5 J/cm 3 compared to 1-2 J/cm 3 for commercial capacitors, and high energy storage efficiency (over 95%) at a relatively low electric field of 140 MV/m.

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Section: Resultsmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Enhanced Energy Storage with Polar Vortices in Ferroelectric Nanocomposites

et al. 2017

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“…Figure 2 illustrates the faceting that develops on these initially circular domain patterns after one day at zero field. The original Bessel-function-like domain pattern [16,17]is now roughly hexagonal.…”

Section: Methodsmentioning

confidence: 99%

Nanodomain faceting in ferroelectrics

Scott¹,

Gruverman²,

Wu³

et al. 2008

J. Phys.: Condens. Matter

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We show that after long times (24 h), individual circular domains in 50 nm thick [001] epitaxial films of ferroelectric lead zirconate titanate (PZT) develop facets due to the crystalline anisotropy, e.g. along [100] directions. This appears to be a creep process (Tybell et al 2002 Phys. Rev. Lett. 89 097601; Paruch et al 2006 J. Appl. Phys. 100 051608) and was first seen in a nanoarray of 180° domains (Ganpule et al 2002 Phys. Rev. B 65 014101). The effect is independent of polarity and thus rules out any electronic dependence on different work functions for top and bottom electrodes. The phenomenon is interpreted instead as a mechanical relaxation due to highly inhomogeneous stress distributions on the nanodisks, assumed to have stress-free edges.

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“…This also explains why such vortex domains were never observed with slow rise time or sinusoidal voltages. It is worthwhile emphasizing that similar vortex domain structures in ferroelectric cylinders were recently predicted in Luk'yanchuk's theoretical paper [23], which shows analytically that the stable domain configuration in a thin PZT disc under an applied field is a second-order Bessel function appearing with an unswitched edge and a "hole" in the middle.…”

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confidence: 91%