Universität zu Köln

Schoenherr, P., Mueller, J., Koehler, L., Rosch, A., Kanazawa, N., Tokura, Y., Garst, M. and Meier, D. (2018). Topological domain walls in helimagnets. Nat. Phys., 14 (5). S. 465 - 470. LONDON: NATURE PUBLISHING GROUP. ISSN 1745-2481

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Abstract

Domain walls naturally arise whenever a symmetry is spontaneously broken. They interconnect regions with different realizations of the broken symmetry, promoting structure formation from cosmological length scales to the atomic level(1,2). In ferroelectric and ferromagnetic materials, domain walls with unique functionalities emerge, holding great promise for nanoelectronics and spintronics applications(3-5). These walls are usually of Ising, Bloch or Neel type and separate homogeneously ordered domains. Here we demonstrate that a wide variety of new domain walls occurs in the presence of spatially modulated domain states. Using magnetic force microscopy and micromagnetic simulations, we show three fundamental classes of domain walls to arise in the near-room-temperature helimagnet iron germanium. In contrast to conventional ferroics, the domain walls exhibit a well-defined inner structure, which-analogous to cholesteric liquid crystals-consists of topological disclination and dislocation defects. Similar to the magnetic skyrmions that form in the same material(6,7), the domain walls can carry a finite topological charge, permitting an efficient coupling to spin currents and contributions to a topological Hall effect. Our study establishes a new family of magnetic nano-objects with non-trivial topology, opening the door to innovative device concepts based on helimagnetic domain walls.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schoenherr, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mueller, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Koehler, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kanazawa, N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tokura, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED Garst, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meier, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-187127
DOI:	10.1038/s41567-018-0056-5
Journal or Publication Title:	Nat. Phys.
Volume:	14
Number:	5
Page Range:	S. 465 - 470
Date:	2018
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	1745-2481
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language NON-FERMI-LIQUID; MAGNETIC-STRUCTURES; SKYRMIONS; DYNAMICS; FEGE; CRYSTALS; PHASE; MNSI Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18712