Temperature dependence of current-driven and Brownian skyrmion dynamics in ferrimagnets with compensation point

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Magnetic skyrmions are topological spin textures and promising candidates for novel spintronic applications. Recent studies on the current-driven dynamics of ferromagnetic (FM) skyrmions revealed that they exhibit an undesirable transverse motion, the skyrmion Hall effect. For antiferromagnetic (AFM) skyrmions, a vanishing skyrmion Hall effect was predicted, along with faster dynamics. However, their zero net magnetization obstructs efficient detection. Ferrimagnetic (FI) materials promise to combine both advantages: fast, AFM-like dynamics and easy read-out via stray fields. Here, we investigate the current-driven and Brownian dynamics of skyrmions in a FI with a compensation point. We perform atomistic spin dynamics simulations based on a model Hamiltonian and the stochastic Landau-Lifshitz-Gilbert equation supplemented with spin-orbit torques, accompanied by analytical calculations based on a collective coordinate approach. Our results unveil a nonmonotonic temperature dependence of the velocities and the diffusion coefficient with a strong enhancement at the angular momentum compensation temperature, due to scaling from FM- to AFM-like dynamics. These findings open up a new pathway for the efficient manipulation of skyrmion dynamics via temperature.

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ISO 690WEISSENHOFER, Markus, Ulrich NOWAK, 2023. Temperature dependence of current-driven and Brownian skyrmion dynamics in ferrimagnets with compensation point. In: Physical Review B. American Physical Society (APS). 2023, 107(6), 064423. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/physrevb.107.064423
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@article{Weienhofer2023-02-24Tempe-66264,
  year={2023},
  doi={10.1103/physrevb.107.064423},
  title={Temperature dependence of current-driven and Brownian skyrmion dynamics in ferrimagnets with compensation point},
  number={6},
  volume={107},
  issn={2469-9950},
  journal={Physical Review B},
  author={Weißenhofer, Markus and Nowak, Ulrich},
  note={Article Number: 064423}
}
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