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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2012

Novel complex phenomena in ferroelectric nanocomposites

Résumé

A first-principles-based effective Hamiltonian is used to investigate finite-temperature properties of ferroelectric nanocomposites made of periodic arrays of ferroelectric nanowires embedded in a matrix formed by another ferroelectric material. Novel transitions and features related to flux-closure configurations are found. Examples include (i) a vortex core transition, that is characterized by the change of the vortex cores from being axisymmetric to exhibiting a 'broken symmetry'; (ii) translational mode of the vortex cores; (iii) striking zigzag dipolar chains along the vortex core axis; and (iv) phase-locking of ferroelectric vortices accompanied by ferroelectric antivortices. These complex phenomena are all found to coexist with a spontaneous electrical polarization aligned along the normal of the plane containing the vortices.
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Dates et versions

hal-00763832 , version 1 (11-12-2012)

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Laurence Louis, I. Kornev, G. Geneste, B. Dkhil, L. Bellaiche. Novel complex phenomena in ferroelectric nanocomposites. Journal of Physics: Condensed Matter, 2012, 24, pp.402201. ⟨10.1088/0953-8984/24/40/402201⟩. ⟨hal-00763832⟩
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