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Interaction and collision of skyrmions in chiral antiferromagnets
by George Theodorou, Stavros Komineas
Submission summary
| Authors (as registered SciPost users): | Stavros Komineas |
| Submission information | |
|---|---|
| Preprint Link: | https://arxiv.org/abs/2305.13515v1 (pdf) |
| Date submitted: | 2023-05-24 07:13 |
| Submitted by: | Komineas, Stavros |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approaches: | Theoretical, Computational |
Abstract
Skyrmions in an antiferromagnet can travel as solitary waves in stark contrast to the situation in ferromagnets. Traveling skyrmion solutions have been found numerically in chiral antiferromagnets. We consider head-on collision events between two skyrmions. We find that the result of the collision depends on the initial velocity of the skyrmions. For small velocities, the skyrmions are shrinking as they are approaching, they bounce back and eventually acquire almost their initial speed. For larger velocities, the skyrmions approach each other and shrink until they become singular points and are eventually annihilated. We describe the observed phenomena in terms of skyrmion energetics and thus determine the regimes of the different dynamical behaviors.
Current status:
Reports on this Submission
Strengths
1-clearly written and structured
2-numerical discovery of new type of skyrmion scattering with associated scale change in antiferromagnetic materials
3- clear discussion of the results, with good set of references
Weaknesses
1-lack of an understanding of the scale change during the skyrmion scattering
Report
This is an interesting account of a novel phenomenon in magnetic skyrmion interactions. While this adds an interesting phenomenon to the long list of different types of skyrmion interaction behaviour, it is hardly a groundbreaking discovery. Neither does it open new synergetic links or pathways for skyrmion research. In that sense it does not meet the expectations of SciPost
Requested changes
Towards the end of the paper the authors begin a discussion of how one might understand the interaction behaviour they observe numerically. This discussion is merely a sketch at the moment: it contains unjustified assumptions (`Assuming that f_2 is larger ...'). The authors should justify this assumption and pursue the analytical study to produce an understanding of the interaction behaviour.
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Ask for major revision