Universität zu Köln

Schuette, Christoph, Iwasaki, Junichi ORCID: 0000-0002-9937-6686, Rosch, Achim ORCID: 0000-0002-6586-5721 and Nagaosa, Naoto (2014). Inertia, diffusion, and dynamics of a driven skyrmion. Phys. Rev. B, 90 (17). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1550-235X

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Abstract

Skyrmions recently discovered in chiral magnets are a promising candidate for magnetic storage devices because of their topological stability, small size (similar to 3-100 nm), and ultralowthreshold current density (similar to 10(6) A/m(2)) to drive their motion. However, the time-dependent dynamics has hitherto been largely unexplored. Here, we show, by combining the numerical solution of the Landau-Lifshitz-Gilbert equation and the analysis of a generalized Thiele's equation, that inertial effects are almost completely absent in skyrmion dynamics driven by a time-dependent current. In contrast, the response to time-dependent magnetic forces and thermal fluctuations depends strongly on frequency and is described by a large effective mass and a (anti-) damping depending on the acceleration of the skyrmion. Thermal diffusion is strongly suppressed by the cyclotron motion and is proportional to the Gilbert damping coefficient a. This indicates that the skyrmion position is stable, and its motion responds to the time-dependent current without delay or retardation even if it is fast. These findings demonstrate the advantages of skyrmions as information carriers.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schuette, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Iwasaki, Junichi UNSPECIFIED orcid.org/0000-0002-9937-6686 UNSPECIFIED Rosch, Achim UNSPECIFIED orcid.org/0000-0002-6586-5721 UNSPECIFIED Nagaosa, Naoto UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-423018
DOI:	10.1103/PhysRevB.90.174434
Journal or Publication Title:	Phys. Rev. B
Volume:	90
Number:	17
Date:	2014
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 CHIRAL MAGNET; FIELD-THEORY; LATTICE; MOTION; STATE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42301