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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Skyrmion ratchet in funnel geometries

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Author(s):
Bellizotti Souza, J. C. [1] ; Vizarim, N. P. [2] ; Reichhardt, C. J. O. [3, 4] ; Reichhardt, C. [3, 4] ; Venegas, P. A. [1]
Total Authors: 5
Affiliation:
[1] UNESP Univ Estadual Paulista, Fac Ciencias, Dept Fis, Caixa Postal 473, BR-17033360 Bauru, SP - Brazil
[2] Univ Estadual Paulista UNESP, Fac Ciencias, Programa Posgrad Ciencia & Tecnol Mat, POSMAT, Caixa Postal 473, BR-17033360 Bauru, SP - Brazil
[3] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 - USA
[4] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 - USA
Total Affiliations: 4
Document type: Journal article
Source: Physical Review B; v. 104, n. 5 AUG 25 2021.
Web of Science Citations: 0
Abstract

Using a particle-based model, we simulate the behavior of a skyrmion under the influence of asymmetric funnel geometries and ac driving at zero temperature. We specifically investigate possibilities for controlling the skyrmion motion by harnessing a ratchet effect. Our results show that as the amplitude of a unidirectional ac drive is increased, the skyrmion can be set into motion along either the easy or hard direction of the funnel depending on the ac driving direction. When the ac drive is parallel to the funnel axis, the skyrmion flows in the easy direction and its average velocity is quantized. In contrast, when the ac drive is perpendicular to the funnel axis, a Magnus-induced ratchet effect occurs, and the skyrmion moves along the hard direction with a constant average velocity. For biharmonic ac driving of equal amplitude along both the parallel and perpendicular directions, we observe a reentrant pinning phase where the skyrmion ratchet vanishes. For asymmetric biharmonic ac drives, the skyrmion exhibits a combination of effects and can move in either the easy or hard direction depending on the configuration of the ac drives. These results indicate that it is possible to achieve controlled skyrmion motion using funnel geometries, and we discuss ways in which this could be harnessed to perform data transfer operations. (AU)

FAPESP's process: 17/20976-3 - Dynamic behavior of skyrmions under the influence of periodic pinning in chiral magnetic infinite thin films
Grantee:Nicolas Porto Vizarim
Support Opportunities: Scholarships in Brazil - Doctorate