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  Magnetic skyrmions in a thickness tunable 2D ferromagnet from a defect driven Dzyaloshinskii-Moriya interaction

Chakraborty, A., Srivastava, A. K., Sharma, A. K., Gopi, A. K., Mohseni, K., Ernst, A., et al. (2022). Magnetic skyrmions in a thickness tunable 2D ferromagnet from a defect driven Dzyaloshinskii-Moriya interaction. Advanced Materials, 34(11): 2108637. doi:10.1002/adma.202108637.

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Advanced Materials-2022-Chakraborty.pdf (Publisher version), 2MB
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https://doi.org/10.1002/adma.202108637 (Publisher version)
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Chakraborty, Anirban1, Author              
Srivastava, Abhay K.1, Author              
Sharma, Ankit K.1, Author              
Gopi, Ajesh K.1, Author              
Mohseni, Katayoon2, Author              
Ernst, Arthur3, Author
Deniz, Hakan1, Author              
Hazra, Binoy Krishna1, Author              
Das, Souvik1, Author              
Sessi, Paolo1, Author              
Kostanovskiy, Ilya1, Author              
Ma, Tianping1, Author              
Meyerheim, Holger L.2, Author              
Parkin, Stuart S. P.1, Author              
Affiliations:
1Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3287476              
2Department of Synthetic Materials and Functional Devices (SMFD), Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3316580              
3external, ou_persistent22              

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 Abstract: There is considerable interest in van der Waals (vdW) materials as potential hosts for chiral skyrmionic spin textures. Of particular interest is the ferromagnetic, metallic compound Fe3GeTe2 (FGT), which has a comparatively high Curie temperature (150–220 K). Several recent studies have reported the observation of chiral Néel skyrmions in this compound, which is inconsistent with its presumed centrosymmetric structure. Here the observation of Néel type skyrmions in single crystals of FGT via Lorentz transmission electron microscopy (LTEM) is reported. It is shown from detailed X-ray diffraction structure analysis that FGT lacks an inversion symmetry as a result of an asymmetric distribution of Fe vacancies. This vacancy-induced breaking of the inversion symmetry of this compound is a surprising and novel observation and is a prerequisite for a Dzyaloshinskii–Moriya vector exchange interaction which accounts for the chiral Néel skyrmion phase. This phenomenon is likely to be common to many 2D vdW materials and suggests a path to the preparation of many such acentric compounds. Furthermore, it is found that the skyrmion size in FGT is strongly dependent on its thickness: the skyrmion size increases from ≈100 to ≈750 nm as the thickness of the lamella is increased from ≈90 nm to ≈2 µm. This extreme size tunability is a feature common to many low symmetry ferro- and ferri-magnetic compounds.

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 Dates: 2022-01-192022-03-17
 Publication Status: Published in print
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 Identifiers: ISI: 000750303300001
DOI: 10.1002/adma.202108637
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Title: Advanced Materials
  Other : Adv. Mater.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: - Volume / Issue: 34 (11) Sequence Number: 2108637 Start / End Page: - Identifier: ISSN: 0935-9648
CoNE: https://pure.mpg.de/cone/journals/resource/954925570855