Ferroic switching, avalanches, and the Larkin length: Needle domains in LaAlO3

Harrison, Richard J. and Salje, Ekhard K. H. (2011) Ferroic switching, avalanches, and the Larkin length: Needle domains in LaAlO3. Applied Physics Letters, 99 (15). p. 151915. DOI 10.1063/1.3650475

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Abstract

Propagation of wedge-shaped needle domains in LaAlO3 is driven mechanically and the change of wall shapes is observed. Twin walls remain smooth, whereas the one-dimensional front line of the needle tip shows “wiggles” when propagating through defect fields. The front line becomes highly distorted during approach to, or retraction from, the sample surface. Singularities of the characteristic (∼Larkin) length occur when the front line breaks. Elastic forces produce planar twin walls with very large Larkin lengths, whereas the front line is not restrained by the compatibility energy and displays considerably shorter Larkin lengths.

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA63;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Applied Physics Letters
Volume: 99
Page Range: p. 151915
Identification Number: 10.1063/1.3650475
Depositing User: Sarah Humbert
Date Deposited: 21 Dec 2011 16:13
Last Modified: 23 Jul 2013 10:03
URI: http://eprints.esc.cam.ac.uk/id/eprint/2306

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