Universität zu Köln

Nattermann, T. (2014). Domain walls in helical magnets: Elasticity and pinning. EPL, 105 (2). MULHOUSE: EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY. ISSN 1286-4854

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Abstract

Recently completely new types of domain walls (DWs) have been discovered in helical magnets, consisting generically of a regular array of pairs of magnetic vortex lines (Li F. et al., Phys. Rev. Lett., 108 (2012) 107203). Only for special orientations DWs are free of vortices. In this paper we calculate their elastic and pinning properties, using the pitch angle. as a small parameter. In particular we show that vortex-free DWs exhibit long-range elasticity which makes them very stiff and suppresses their pinning by impurities. Their roughening transition temperature is of the order of the Neel temperature. DWs including vortices (either by orientation or due to step formation above their roughening transition) show short-range elasticity and strong pinning by impurities. These results apply both to centrosymmetric as well as to non-centrosymmetric systems. The application to chiral liquid crystals is briefly discussed. Copyright (c) EPLA, 2014

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Nattermann, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-450634
DOI:	10.1209/0295-5075/105/27004
Journal or Publication Title:	EPL
Volume:	105
Number:	2
Date:	2014
Publisher:	EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
Place of Publication:	MULHOUSE
ISSN:	1286-4854
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FIELD ISING-MODEL; TRANSITION; DYNAMICS; ORDER; OXIDE Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/45063