Universität zu Köln

Mueller, Jan and Rosch, Achim ORCID: 0000-0002-6586-5721 (2015). Capturing of a magnetic skyrmion with a hole. Phys. Rev. B, 91 (5). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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Abstract

Magnetic whirls in chiral magnets, so-called skyrmions, can be manipulated by ultrasmall current densities. Here we study both analytically and numerically the interactions of a single skyrmion in two dimensions with a small hole in the magnetic layer. Results from micromagnetic simulations are in good agreement with effective equations of motion obtained from a generalization of the Thiele approach. Skyrmion-defect interactions are described by an effective potential with both repulsive and attractive components. For small current densities a previously pinned skyrmion stays pinned whereas an unpinned skyrmion moves around the impurities and never gets captured. For higher current densities, j(c1) < j < j(c2), however, single holes are able to capture moving skyrmions. The maximal cross section is proportional to the skyrmion radius and to root alpha, where a is the Gilbert damping. For j > j(c2) all skyrmions are depinned. Small changes of the magnetic field strongly change the pinning properties; one can even reach a regime without pinning, j (c2) = 0. We also show that a small density of holes can effectively accelerate the motion of the skyrmion and introduce a Hall effect for the skyrmion.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mueller, Jan UNSPECIFIED UNSPECIFIED UNSPECIFIED Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-412342
DOI:	10.1103/PhysRevB.91.054410
Journal or Publication Title:	Phys. Rev. B
Volume:	91
Number:	5
Date:	2015
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1550-235X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DYNAMICS; MOTION; FERROMAGNETS; LATTICE; MNSI Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/41234