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Nucleation and annihilation of skyrmions in Mn2CoAl observed through the topological Hall effect.

ABSTRACT: Magnetic skyrmions are topologically protected spin textures with great technological potential. These topologically non-trivial non-coplanar spin textures give rise to a topological Hall effect, enabling the purely electronic detection of magnetic skyrmions. We report a clear topological Hall effect in thin films of the the Heusler alloy Mn2CoAl, a ferromagnetic spin-gapless semiconductor, capped by a thin layer of Pd. We exploit the strong thickness- and temperature-dependence of the anomalous Hall effect in this system, tuning it to zero to enable the unambiguous measurement of the topological Hall effect, which is observed for temperatures between 3?K and 280?K. The topological Hall effect is evidence of skyrmions, and we demonstrate the simultaneous coexistence of opposite polarity skyrmions using a novel method involving minor field loops of the Hall effect.

SUBMITTER: Ludbrook BM

PROVIDER: S-EPMC5648899 | biostudies-other | 2017 Oct

REPOSITORIES: biostudies-other

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Nucleation and annihilation of skyrmions in Mn<sub>2</sub>CoAl observed through the topological Hall effect.

Ludbrook B M BM Dubuis G G Puichaud A-H AH Ruck B J BJ Granville S S

Scientific reports 20171019 1

Magnetic skyrmions are topologically protected spin textures with great technological potential. These topologically non-trivial non-coplanar spin textures give rise to a topological Hall effect, enabling the purely electronic detection of magnetic skyrmions. We report a clear topological Hall effect in thin films of the the Heusler alloy Mn<sub>2</sub>CoAl, a ferromagnetic spin-gapless semiconductor, capped by a thin layer of Pd. We exploit the strong thickness- and temperature-dependence of th ...[more]

PMID: 29051573

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