Universität zu Köln

Roostaei, Bahman (2014). Vortex wall dynamics and pinning in helical magnets. Eur. Phys. J. B, 87 (6). NEW YORK: SPRINGER. ISSN 1434-6036

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Abstract

Domain walls formed by one dimensional array of vortex lines have been recently predicted to exist in disordered helical magnets and multiferroics. These systems are on one hand analogues to the vortex line lattices in type-II superconductors while on the other hand they propagate in the magnetic medium as a domain boundary. Using a long wavelength approach supported by numerical optimization we lay out detailed theory for dynamics and structure of such topological fluctuations at zero temperature in presence of weak disorder. We show the interaction between vortex lines is weak. This is the direct consequence of the screening of the vorticity by helical background in the system. We explain how one can use this result to understand the elasticity of the wall with a vicinal surface approach. Also we show the internal degree of freedom of this array leads to the enhancement of its mobility. We present estimates for the interaction and mobility enhancements using the microscopic parameters of the system. Finally we determine the range of velocities/force densities in which the internal movement of the vortex wall can be effective in its dynamics.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Roostaei, Bahman UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-436011
DOI:	10.1140/epjb/e2014-50067-7
Journal or Publication Title:	Eur. Phys. J. B
Volume:	87
Number:	6
Date:	2014
Publisher:	SPRINGER
Place of Publication:	NEW YORK
ISSN:	1434-6036
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DOMAIN-WALLS; FERROELECTRICITY Multiple languages Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43601