Skyrmion model of nano-domain nucleation in ferroelectrics and ferromagnets

Dawber, M. and Gruverman, A. and Scott, J. F. (2006) Skyrmion model of nano-domain nucleation in ferroelectrics and ferromagnets. Journal of Physics-Condensed Matter, 18 (5). L71-L79. DOI 10.1088/0953-8984/18/5/L03

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Abstract

A skyrmion model of nano-domain ejection from large domain walls in ferroelectrics is presented, together with data on lead germanate Pb5Ge3O11 and comparison data on ferromagnetic iron garnet. Notable is the occurrence of a short-wavelength transverse wall instability (wiggles) prior to the nano-domain emission. This nonlinear, defect-free model is qualitatively different from all known models of ferroelectric nucleation and propagation; nucleation in ferroelectrics has almost always been viewed as inhomogeneous, initiated at static impurity or defect sites that are fixed in space; the present model is also inhomogeneous but involves nucleation at existing domain walls, which are dynamic and not fixed in space. This defect-free ferroelectric nucleation model contrasts with the frequently invoked mechanism in thin-film switching of nucleation at electrode–dielectric interfaces and thus has significant implications for the ultimate switching speed in thin-film memory devices.

Item Type: Article
Uncontrolled Keywords: 2006 AREP IA50 2006 P
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Journal of Physics-Condensed Matter
Volume: 18
Page Range: L71-L79
Identification Number: 10.1088/0953-8984/18/5/L03
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:02
Last Modified: 23 Jul 2013 10:06
URI: http://eprints.esc.cam.ac.uk/id/eprint/237

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