Shaking and pushing skyrmions: Formation of a non-equilibrium phase with zero critical current
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arXiv
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| Format: | Preprint |
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2025
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| author | Rucker, Felix Bezvershenko, Alla Mettus, Denis Bauer, Andreas Garst, Markus Rosch, Achim Pfleiderer, Christian |
| author_facet | Rucker, Felix Bezvershenko, Alla Mettus, Denis Bauer, Andreas Garst, Markus Rosch, Achim Pfleiderer, Christian |
| contents | In three-dimensional chiral magnets, skyrmions are line-like objects oriented parallel to the applied magnetic field. The efficient coupling of magnetic skyrmion lattices to spin currents and magnetic fields permits their dynamical manipulation. Here, we explore the dynamics of skyrmion lattices when slowly oscillating the field direction by up to a few degrees on millisecond timescales while simultaneously pushing the skyrmion lattice by electric currents. The field oscillations induce a shaking of the orientation of the skyrmion lines, leading to a phase where the critical depinning current for translational motion vanishes. We measure the transverse susceptibility of MnSi to track various depinning phase transitions induced by currents, oscillating fields, or combinations thereof. An effective slip--stick model for the bending and motion of the skyrmion lines in the presence of disorder explains main features of the experiment and predicts the existence of several dynamical skyrmion lattice phases under shaking and pushing representing new phases of matter far from thermal equilibrium. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_01133 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Shaking and pushing skyrmions: Formation of a non-equilibrium phase with zero critical current Rucker, Felix Bezvershenko, Alla Mettus, Denis Bauer, Andreas Garst, Markus Rosch, Achim Pfleiderer, Christian Strongly Correlated Electrons Mesoscale and Nanoscale Physics In three-dimensional chiral magnets, skyrmions are line-like objects oriented parallel to the applied magnetic field. The efficient coupling of magnetic skyrmion lattices to spin currents and magnetic fields permits their dynamical manipulation. Here, we explore the dynamics of skyrmion lattices when slowly oscillating the field direction by up to a few degrees on millisecond timescales while simultaneously pushing the skyrmion lattice by electric currents. The field oscillations induce a shaking of the orientation of the skyrmion lines, leading to a phase where the critical depinning current for translational motion vanishes. We measure the transverse susceptibility of MnSi to track various depinning phase transitions induced by currents, oscillating fields, or combinations thereof. An effective slip--stick model for the bending and motion of the skyrmion lines in the presence of disorder explains main features of the experiment and predicts the existence of several dynamical skyrmion lattice phases under shaking and pushing representing new phases of matter far from thermal equilibrium. |
| title | Shaking and pushing skyrmions: Formation of a non-equilibrium phase with zero critical current |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2504.01133 |