SKM 2021 – scientific programme

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MA: Fachverband Magnetismus

MA 5: Posters Magnetism II

MA 5.6: Poster

Tuesday, September 28, 2021, 10:00–13:00, P

Topological Hall effect in thin films of noncollinear magnets — •Rebeca Ibarra^{1, 2}, Anastasios Markou¹, Aleksandr Sukhanov², Dmytro Inosov², and Claudia Felser¹ — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²Technical University Dresden, Germany

Topological spin textures in quantum materials are of great interest, along with the associate transport signatures, for next-generation spintronic applications. Recently, the tetragonal (t) Heusler compounds show to host elliptical skyrmions and antiskyrmions [1], and the hexagonal (h) half-Heusler compound MnPtGa displays noncollinear magnetism [2]. Spin chirality in metallic materials with noncoplanar spin structure gives rise to a Berry phase-induced topological Hall effect. In addition, neutron diffraction is a powerful technique to study the magnetic structure of these chiral materials.

Here, we study the noncollinear spin textures in high-quality epitaxial thin films of the t-Mn₂RhSn and h-MnPtGa compounds. In t-Mn₂RhSn, we observe topological Hall signatures of two distinct chiral spin textures. Interestingly, we show with single-crystal neutron diffraction that the h-MnPtGa undergoes a magnetic phase transition from ferromagnetic to in-plane canted antiferromagnetic. With our thin film method, we can access a novel and fundamental understanding of these compounds not possible with other methods.

[1] J. Jena et al., Nat. Commun. 11, 1115 (2020).
[2] J. A. Cooley et al., Phys. Rev. Mater. 4, 044405 (2020).