Flicker vortex structures in multiferroic materials

Zhao, Z and Ding, X and Salje, E. K. H. (2014) Flicker vortex structures in multiferroic materials. Applied Physics Letters, 105 (ARTN 1). ISSN 00036951 DOI https://doi.org/10.1063/1.4896143

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Computer simulation of ferroelastic materials reveals dynamic polar vortex structures related to flexo-electricity between cation and anion lattices. At finite temperatures, the vortices are found to flicker in time and space. Widely spaced ferroelastic twin boundaries nucleate vortices while dense twin boundaries suppress them. The time averaged number of vortices at any site decays exponentially, indicating the highly mobile dynamics of the vortex lattice. Applied electric fields break the rotational symmetry of vortices and finally destroy them. The total number density of vortices follows a field and temperature dependence as N(E)=N0/[1+A exp(E/k(T−TVF))] with T VF < 0. The observed vortex structures are akin to those observed in magnetic and superconducting disordered vortex lattices.

Item Type: Article
Uncontrolled Keywords: 2014AREP; IA68;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Applied Physics Letters
Volume: 105
Identification Number: https://doi.org/10.1063/1.4896143
Depositing User: Sarah Humbert
Date Deposited: 21 Nov 2014 19:14
Last Modified: 18 Dec 2014 17:56
URI: http://eprints.esc.cam.ac.uk/id/eprint/3154

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