Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates

Reichhardt, C.; Ray, D.; Reichhardt, C. J. Olson

doi:10.1088/1367-2630/17/7/073034

Title: Magnus-induced ratchet effects for skyrmions interacting with asymmetric substrates

Journal Article · Wed Jul 01 00:00:00 EDT 2015 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/17/7/073034· OSTI ID:1239044

Reichhardt, C.; Ray, D.; Reichhardt, C. J. Olson

We show using numerical simulations that pronounced ratchet effects can occur for ac driven skyrmions moving over asymmetric quasi-one-dimensional substrates. We find a new type of ratchet effect called a Magnus-induced transverse ratchet that arises when the ac driving force is applied perpendicular rather than parallel to the asymmetry direction of the substrate. This transverse ratchet effect only occurs when the Magnus term is finite, and the threshold ac amplitude needed to induce it decreases as the Magnus term becomes more prominent. Ratcheting skyrmions follow ordered orbits in which the net displacement parallel to the substrate asymmetry direction is quantized. As a result, skyrmion ratchets represent a new ac current-based method for controlling skyrmion positions and motion for spintronic applications.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1239044

Alternate ID(s):: OSTI ID: 1222592; OSTI ID: 1235938; OSTI ID: 1239047

Report Number(s):: LA-UR-15-23457

Journal Information:: New Journal of Physics, Vol. 17, Issue 7; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

Citation Metrics:

Cited by: 42 works

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