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Asymmetric slow dynamics of the skyrmion lattice in MnSi

Soda, Minoru ; Forgan, Edward M. ; Blackburn, Elizabeth LU ; Campillo, Emma LU ; Ryukhtin, Vasyl ; Hoffmann, Ingo ; Kikkawa, Akiko ; Taguchi, Yasujiro ; Yoshizawa, Hideki and Kawano-Furukawa, Hazuki (2023) In Nature Physics 19(10). p.1476-1481
Abstract

Some magnetic systems feature spin textures, real-space patterns in the orientation of spins that can topologically form non-trivial configurations. Among them, a vortex-like spin swirling texture known as a magnetic skyrmion has attracted particular attention. Lattices of skyrmions form in the helimagnet MnSi with a periodicity of 18 nm, which makes them amenable to investigation by Lorentz transmission electron microscopy in real space and by small-angle neutron scattering in momentum space. However, the dynamics of the skyrmion lattice have not been studied in detail because of the difficulty of inelastic neutron scattering measurements that can measure the dynamic structure factor at the microelectronvolts energy scale at small... (More)

Some magnetic systems feature spin textures, real-space patterns in the orientation of spins that can topologically form non-trivial configurations. Among them, a vortex-like spin swirling texture known as a magnetic skyrmion has attracted particular attention. Lattices of skyrmions form in the helimagnet MnSi with a periodicity of 18 nm, which makes them amenable to investigation by Lorentz transmission electron microscopy in real space and by small-angle neutron scattering in momentum space. However, the dynamics of the skyrmion lattice have not been studied in detail because of the difficulty of inelastic neutron scattering measurements that can measure the dynamic structure factor at the microelectronvolts energy scale at small wavevectors. Here we examine the low-energy excitations of the skyrmion state in MnSi by using the neutron spin-echo technique under small-angle neutron scattering conditions. We observe an asymmetric dispersion of the phason excitations of the lattice because of the string-like structure of the skyrmion cores.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Physics
volume
19
issue
10
pages
1476 - 1481
publisher
Nature Publishing Group
external identifiers
  • scopus:85164810717
ISSN
1745-2473
DOI
10.1038/s41567-023-02120-5
language
English
LU publication?
yes
id
569e1ffa-5262-4919-a108-95525ea67dd5
date added to LUP
2023-10-04 14:56:40
date last changed
2024-01-12 10:32:07
@article{569e1ffa-5262-4919-a108-95525ea67dd5,
  abstract     = {{<p>Some magnetic systems feature spin textures, real-space patterns in the orientation of spins that can topologically form non-trivial configurations. Among them, a vortex-like spin swirling texture known as a magnetic skyrmion has attracted particular attention. Lattices of skyrmions form in the helimagnet MnSi with a periodicity of 18 nm, which makes them amenable to investigation by Lorentz transmission electron microscopy in real space and by small-angle neutron scattering in momentum space. However, the dynamics of the skyrmion lattice have not been studied in detail because of the difficulty of inelastic neutron scattering measurements that can measure the dynamic structure factor at the microelectronvolts energy scale at small wavevectors. Here we examine the low-energy excitations of the skyrmion state in MnSi by using the neutron spin-echo technique under small-angle neutron scattering conditions. We observe an asymmetric dispersion of the phason excitations of the lattice because of the string-like structure of the skyrmion cores.</p>}},
  author       = {{Soda, Minoru and Forgan, Edward M. and Blackburn, Elizabeth and Campillo, Emma and Ryukhtin, Vasyl and Hoffmann, Ingo and Kikkawa, Akiko and Taguchi, Yasujiro and Yoshizawa, Hideki and Kawano-Furukawa, Hazuki}},
  issn         = {{1745-2473}},
  language     = {{eng}},
  number       = {{10}},
  pages        = {{1476--1481}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Physics}},
  title        = {{Asymmetric slow dynamics of the skyrmion lattice in MnSi}},
  url          = {{http://dx.doi.org/10.1038/s41567-023-02120-5}},
  doi          = {{10.1038/s41567-023-02120-5}},
  volume       = {{19}},
  year         = {{2023}},
}