Walker breakdown of Brownian domain wall dynamics
Walker breakdown of Brownian domain wall dynamics
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2022
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Physical Review B ; 106 (2022), 10. - 104428. - American Physical Society (APS). - ISSN 2469-9950. - eISSN 2469-9969
Abstract
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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WEISSENHOFER, Markus, Severin SELZER, Ulrich NOWAK, 2022. Walker breakdown of Brownian domain wall dynamics. In: Physical Review B. American Physical Society (APS). 106(10), 104428. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.106.104428BibTex
@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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