Field-induced vortices in weakly anisotropic ferroelectrics |
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| Authors: | A Sené L Baudry I Luk’yanchuk L Lahoche Y El Amraoui |
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| Institution: | 1. Laboratory of Condensed Matter Physics, University of Picardie Jules Verne, Amiens, 80039, France;2. Institut d’Electronique, de Microélectronique et de Nanotechnologie (IEMN), UMR CNRS 8520, Département Hyperfréquences et Semi-conducteurs, Université des Sciences et Technologies de Lille, Avenue Poincaré, BP 69, 59652 Villeneuve d’Ascq Cedex, France;3. Roberval Laboratory, University of Technology, Compiegne, 60200, France;4. LMCN, département de Physique, FSTG Marrakech, Morocco |
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| Abstract: | In microscale and nanoscale ferroelectric samples, the formation and growth of domains are the usual stages of the polarization switching mechanism. By assuming weak polarization anisotropy and by solving the Ginzburg–Landau–Khalatnikov equation we have explored an alternative mechanism which consists in ferroelectric switching induced by vortex formation. We have studied the polarization dynamics inside a ferroelectric circular capacitor where switching leads to the formation of a metastable vortex state with a rotational motion of the polarization. Our results are consistent with recent first-principle simulations I.I. Naumov, H.X. Fu, Phys. Rev. Lett. 98, 077603 (2007)] and with experiments on PbZr0.2Ti0.8O3 A. Gruverman, D. Wu, H.J. Fan, I. Vrejoiu, M. Alexe, R.J. Harrison, J.F. Scott, J. Phys. Condens. Matter 20 342201(2008)] and demonstrate that vortex-induced polarization switching can be an effective mechanism for circular nanocapacitors. |
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| Keywords: | Ferroelectric domains Polarization switching Vortex |
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