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  4. Seeding and Emergence of Composite Skyrmions in a van der Waals Magnet
 
research article

Seeding and Emergence of Composite Skyrmions in a van der Waals Magnet

Powalla, Lukas
•
Birch, Max T.
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Litzius, Kai
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February 8, 2023
Advanced Materials

Topological charge plays a significant role in a range of physical systems. In particular, observations of real-space topological objects in magnetic materials have been largely limited to skyrmions - states with a unitary topological charge. Recently, more exotic states with varying topology, such as antiskyrmions, merons, or bimerons and 3D states such as skyrmion strings, chiral bobbers, and hopfions, have been experimentally reported. Along these lines, the realization of states with higher-order topology has the potential to open new avenues of research in topological magnetism and its spintronic applications. Here, real-space imaging of such spin textures, including skyrmion, skyrmionium, skyrmion bag, and skyrmion sack states, observed in exfoliated flakes of the van der Waals magnet Fe3-xGeTe2 (FGT) is reported. These composite skyrmions may emerge from seeded, loop-like states condensed into the stripe domain structure, demonstrating the possibility to realize spin textures with arbitrary integer topological charge within exfoliated flakes of 2D magnets. The general nature of the formation mechanism motivates the search for composite skyrmion states in both well-known and new magnetic materials, which may yet reveal an even richer spectrum of higher-order topological objects.

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Type
research article
DOI
10.1002/adma.202208930
Web of Science ID

WOS:000929195700001

Author(s)
Powalla, Lukas
Birch, Max T.
Litzius, Kai
Wintz, Sebastian
Yasin, Fehmi S.
Turnbull, Luke A.
Schulz, Frank
Mayoh, Daniel A.
Balakrishnan, Geetha
Weigand, Markus
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Date Issued

2023-02-08

Publisher

Wiley-V C H Verlag Gmbh

Published in
Advanced Materials
Subjects

Chemistry, Multidisciplinary

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Chemistry, Physical

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Nanoscience & Nanotechnology

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Materials Science, Multidisciplinary

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Physics, Applied

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Physics, Condensed Matter

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Chemistry

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Science & Technology - Other Topics

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Materials Science

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Physics

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composite skyrmions

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fe3gete2

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micromagnetic simulation

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skyrmioniums

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x-ray microscopy

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real-space observation

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room-temperature

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dynamics

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSEN  
Available on Infoscience
March 13, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/195855
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