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Chiral Spin Spirals at the Surface of the van der Waals Ferromagnet Fe3GeTe2.

ABSTRACT: Topologically protected magnetic structures provide a robust platform for low power consumption devices for computation and data storage. Examples of these structures are skyrmions, chiral domain walls, and spin spirals. Here, we use scanning electron microscopy with polarization analysis to unveil the presence of chiral counterclockwise Néel spin spirals at the surface of a bulk van der Waals ferromagnet Fe3GeTe2 (FGT) at zero magnetic field. These Néel spin spirals survive up to FGT's Curie temperature of TC = 220 K, with little change in the periodicity p = 300 nm of the spin spiral throughout the studied temperature range. The formation of a spin spiral showing counterclockwise rotation strongly suggests the presence of a positive Dzyaloshinskii-Moriya interaction in FGT, which provides the first steps towards the understanding of the magnetic structure of FGT. Our results additionally pave the way for chiral magnetism in van der Waals materials and their heterostructures.

SUBMITTER: Meijer MJ 

PROVIDER: S-EPMC7729936 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature

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Chiral Spin Spirals at the Surface of the van der Waals Ferromagnet Fe<sub>3</sub>GeTe<sub>2</sub>.

Meijer Mariëlle J MJ   Lucassen Juriaan J   Duine Rembert A RA   Swagten Henk J M HJM   Koopmans Bert B   Lavrijsen Reinoud R   Guimarães Marcos H D MHD  

Nano letters 20201125 12

Topologically protected magnetic structures provide a robust platform for low power consumption devices for computation and data storage. Examples of these structures are skyrmions, chiral domain walls, and spin spirals. Here, we use scanning electron microscopy with polarization analysis to unveil the presence of chiral counterclockwise Néel spin spirals at the surface of a bulk van der Waals ferromagnet Fe<sub>3</sub>GeTe<sub>2</sub> (FGT) at zero magnetic field. These Néel spin spirals surviv  ...[more]

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