Universität zu Köln

Masell, J., Rodrigues, D. R., McKeever, B. F. and Everschor-Sitte, K. (2020). Spin-transfer torque driven motion, deformation, and instabilities of magnetic skyrmions at high currents. Phys. Rev. B, 101 (21). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

In chiral magnets, localized topological magnetic whirls, magnetic skyrmions, can be moved by spin polarized electric currents. Upon increasing the current strength, with prospects for high-speed skyrmion motion for spintronics applications in mind, isolated skyrmions deform away from their typical circular shape. We analyze the influence of spin-transfer torques on the shape of a single skyrmion, including its stability upon adiabatically increasing the strength of the applied electric current. For rather compact skyrmions at uniaxial anisotropies well above the critical anisotropy for domain wall formation, we find for high current densities that the skyrmion assumes a noncircular shape with a tail, reminiscent of a shooting star. For larger and hence softer skyrmions close to the critical anisotropy, in turn, we observe a critical current density above which skyrmions become unstable. We show that above a second critical current density the shooting star solution can be recovered also for these skyrmions.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Masell, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rodrigues, D. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED McKeever, B. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Everschor-Sitte, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-329659
DOI:	10.1103/PhysRevB.101.214428
Journal or Publication Title:	Phys. Rev. B
Volume:	101
Number:	21
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DYNAMICS; TEMPERATURE; LATTICE; STATE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/32965