Janus skyrmion: Interfacial quasiparticle with two-faced helicity
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912942896709632 |
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| author | Zhang, Xichao Zhang, Rui Shao, Qiming Zhou, Yan Reichhardt, Charles Reichhardt, Cynthia J. O. Mochizuki, Masahito |
| author_facet | Zhang, Xichao Zhang, Rui Shao, Qiming Zhou, Yan Reichhardt, Charles Reichhardt, Cynthia J. O. Mochizuki, Masahito |
| contents | Janus particles are functional particles with at least two surfaces showing asymmetric properties. We show at the interface between two magnetic regions with different antisymmetric exchange interactions, an alternative species of two-dimensional topological quasiparticles can emerge, in which different helicity structures can coexist. We name such an interfacial quasiparticle a "Janus skyrmion," in analogy to the Janus particle. As the Janus skyrmion shows helicity asymmetry, its size could vary with both the in-plane and out-of-plane magnetic fields. A vertical spin current could drive the Janus skyrmion into one-dimensional motion along the interface without showing the skyrmion Hall effect, at a speed which depends on both the in-plane spin-polarization direction and current density. Thermal fluctuations could also lead to one-dimensional random walk of a Brownian Janus skyrmion. This work uncovers unique dynamics intrinsic to interfacial quasiparticles with exotic helicity, which may be realized in interface-engineered magnetic layers. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_07394 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Janus skyrmion: Interfacial quasiparticle with two-faced helicity Zhang, Xichao Zhang, Rui Shao, Qiming Zhou, Yan Reichhardt, Charles Reichhardt, Cynthia J. O. Mochizuki, Masahito Mesoscale and Nanoscale Physics Materials Science Applied Physics Janus particles are functional particles with at least two surfaces showing asymmetric properties. We show at the interface between two magnetic regions with different antisymmetric exchange interactions, an alternative species of two-dimensional topological quasiparticles can emerge, in which different helicity structures can coexist. We name such an interfacial quasiparticle a "Janus skyrmion," in analogy to the Janus particle. As the Janus skyrmion shows helicity asymmetry, its size could vary with both the in-plane and out-of-plane magnetic fields. A vertical spin current could drive the Janus skyrmion into one-dimensional motion along the interface without showing the skyrmion Hall effect, at a speed which depends on both the in-plane spin-polarization direction and current density. Thermal fluctuations could also lead to one-dimensional random walk of a Brownian Janus skyrmion. This work uncovers unique dynamics intrinsic to interfacial quasiparticles with exotic helicity, which may be realized in interface-engineered magnetic layers. |
| title | Janus skyrmion: Interfacial quasiparticle with two-faced helicity |
| topic | Mesoscale and Nanoscale Physics Materials Science Applied Physics |
| url | https://arxiv.org/abs/2509.07394 |