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  Observation of robust Néel skyrmions in metallic PtMnGa

Srivastava, A. K., Devi, P., Sharma, A. K., Ma, T., Deniz, H., Meyerheim, H. L., et al. (2020). Observation of robust Néel skyrmions in metallic PtMnGa. Advanced Materials, 32: 1904327. doi:10.1002/adma.201904327.

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adma.201904327.pdf (Publisher version), 2MB
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https://doi.org/10.1002/adma.201904327 (Publisher version)
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 Creators:
Srivastava, Abhay K.1, Author              
Devi, Parul2, Author
Sharma, Ankit K.1, Author              
Ma, Tianping1, Author              
Deniz, Hakan1, Author              
Meyerheim, Holger L.3, Author              
Felser, Claudia2, 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              
2External Organizations, ou_persistent22              
3Max Planck Institute of Microstructure Physics, Max Planck Society, ou_2415691              

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 Abstract: Over the past decade the family of chiral noncollinear spin textures has continued to expand with the observation in metallic compounds of Bloch-like skyrmions in several B20 compounds, and antiskyrmions in a tetragonal inverse Heusler. Néel like skyrmions in bulk crystals with broken inversion symmetry have recently been seen in two distinct nonmetallic compounds, GaV4S8 and VOSe2O5 at low temperatures (below ≈13 K) only. Here, the first observation of bulk Néel skyrmions in a metallic compound PtMnGa and, moreover, at high temperatures up to ≈220 K is reported. Lorentz transmission electron microscopy reveals the chiral Néel character of the skyrmions. A strong variation is reported of the size of the skyrmions on the thickness of the lamella in which they are confined, varying by a factor of 7 as the thickness is varied from ≈90 nm to ≈4 µm. Moreover, the skyrmions are highly robust to in-plane magnetic fields and can be stabilized in a zero magnetic field using suitable field-cooling protocols over a very broad temperature range to as low as 5 K. These properties, together with the possibility of manipulating skyrmions in metallic PtMnGa via current induced spin–orbit torques, make them extremely exciting for future spintronic applications.

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 Dates: 2019-12-262020-02-20
 Publication Status: Published in print
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 Rev. Type: Peer
 Identifiers: DOI: 10.1002/adma.201904327
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Project name : Spin Orbitronics for Electronic Technologies (SORBET)
Grant ID : 670166
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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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: 32 Sequence Number: 1904327 Start / End Page: - Identifier: ISSN: 0935-9648
CoNE: https://pure.mpg.de/cone/journals/resource/954925570855