| Full text | |
| Author(s): |
Bellizotti Souza, J. C.
;
Vizarim, N. P.
;
Reichhardt, C. J. O.
;
Reichhardt, C.
;
Venegas, P. A.
Total Authors: 5
|
| Document type: | Journal article |
| Source: | NEW JOURNAL OF PHYSICS; v. 24, n. 10, p. 14-pg., 2022-10-01. |
| Abstract | |
Using a particle-based model, we examine the collective dynamics of skyrmions interacting with a funnel potential under dc driving as the skyrmion density and relative strength of the Magnus and damping terms are varied. For driving in the easy direction, we find that increasing the skyrmion density reduces the average skyrmion velocity due to jamming of skyrmions near the funnel opening, while the Magnus force causes skyrmions to accumulate on one side of the funnel array. For driving in the hard direction, there is a critical skyrmion density below which the skyrmions become trapped. Above this critical value, a clogging effect appears with multiple depinning and repinning states where the skyrmions can rearrange into different clogged configurations, while at higher drives, the velocity-force curves become continuous. When skyrmions pile up near the funnel opening, the effective size of the opening is reduced and the passage of other skyrmions is blocked by the repulsive skyrmion-skyrmion interactions. We observe a strong diode effect in which the critical depinning force is higher and the velocity response is smaller for hard direction driving. As the ratio of Magnus force to dissipative term is varied, the skyrmion velocity varies in a non-linear and non-monotonic way due to the pile up of skyrmions on one side of the funnels. At high Magnus forces, the clogging effect for hard direction driving is diminished. (AU) | |
| FAPESP's process: | 21/04941-0 - Dynamic behavior of Skyrmions in infinite Chiral Films in the presence of periodic Pinning potentials at zero temperature |
| Grantee: | José Carlos Bellizotti Souza |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |
| 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 |