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Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains

Nanna Zhou Hagström et al.
Phys. Rev. B 106, 224424 – Published 23 December 2022

Abstract

Femtosecond optical pumping of magnetic materials has been used to achieve ultrafast switching and recently to nucleate symmetry-broken magnetic states. However, when the magnetic order parameter already presents a broken-symmetry state, such as a domain pattern, the dynamics are poorly understood and consensus remains elusive. Here, we resolve the controversies in the literature by studying the ultrafast response of magnetic domain patterns with varying degrees of translation symmetry with ultrafast x-ray resonant scattering. A data analysis technique is introduced to disentangle the isotropic and anisotropic components of the x-ray scattering. We find that the scattered intensity exhibits a radial shift restricted to the isotropic component, indicating that the far-from-equilibrium magnetization dynamics are intrinsically related to the spatial features of the domain pattern. Our results suggest alternative pathways for the spatiotemporal manipulation of magnetism via far-from-equilibrium dynamics and by carefully tuning the ground-state magnetic textures.

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  • Received 8 July 2022
  • Revised 25 November 2022
  • Accepted 29 November 2022

DOI:https://doi.org/10.1103/PhysRevB.106.224424

©2022 American Physical Society

Physics Subject Headings (PhySH)

Accelerators & BeamsNonlinear DynamicsCondensed Matter, Materials & Applied Physics

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Vol. 106, Iss. 22 — 1 December 2022

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