Walker breakdown of Brownian domain wall dynamics

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Physical Review B. American Physical Society (APS). 2022, 106(10), 104428. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.106.104428
Zusammenfassung

The Brownian motion of domain walls in uniaxial and biaxial ferromagnetic nanowires is studied, comparing spin dynamics simulations with analytical calculations within the framework of a collective coordinate approach. Our results demonstrate that the interplay between spatial and angular dynamics gives rise to a complex time dependence of the MSD in biaxial nanowires and to a drastically reduced diffusion coefficient in uniaxial nanowires, analogous to magnetic skyrmions. This diffusion suppression is also responsible for the peculiar temperature dependence of the diffusion coefficient in biaxial systems: while it is found to scale linearly with temperature up to a certain threshold, the emergence of a Walker breakdown of Brownian motion is responsible for a reduction of the diffusion coefficient with increasing temperature above this threshold.

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ISO 690WEISSENHOFER, Markus, Severin SELZER, Ulrich NOWAK, 2022. Walker breakdown of Brownian domain wall dynamics. In: Physical Review B. American Physical Society (APS). 2022, 106(10), 104428. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.106.104428
BibTex
@article{Weienhofer2022Walke-58887,
  year={2022},
  doi={10.1103/PhysRevB.106.104428},
  title={Walker breakdown of Brownian domain wall dynamics},
  number={10},
  volume={106},
  issn={2469-9950},
  journal={Physical Review B},
  author={Weißenhofer, Markus and Selzer, Severin and Nowak, Ulrich},
  note={Article Number: 104428}
}
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