Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 66: Poster 3

MA 66.14: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG2

Hall effect in Fe_3−xMn_xSi Heusler alloys — •Johannes Kroder, Gerhard Fecher, Guido Kreiner, and Claudia Felser — MPI CPfS, Dresden

The Hall effect occurs in all conducting materials when a magnetic field is applied perpendicular to the current. For ferromagnetic materials the effect may also be observed without applied field which is called anomalous Hall effect (AHE). Intrinsic and extrinsic contributions to the AHE can be distinguished. The intrinsic contribution is associated with the Berry curvature which is present in all ferromagnets. It is usually assumed that the AHE is not present in antiferromagnets because of the vanishing net magnetization. However, Chen et al. [1] pointed out that the AHE can also be observed in antiferromagnets with non-collinear spin structure due to a non vanishing Berry curvature. This was recently experimentally confirmed by Nayak et al. [2]. It is therefore interesting to investigate the well-known Heusler alloys Fe_3−xMn_xSi (0.75 < x < 1.75). These compounds show a transition from collinear to non-collinear ferrimagnetic order below 60 K accompanied with a change of the Berry curvature. We report on the series of polycrystalline Fe_3−xMn_xSi prepared by arc melting and characterized by temperature dependent Hall measurements.
[1] Chen et al., PRL 112, 017205 (2014); [2] Nayak et al., Sci. Adv., e1501870 (2016)