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
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: |
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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: |
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URI: | http://kups.ub.uni-koeln.de/id/eprint/41234 |
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