Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Poster 1

MA 19.39: Poster

Dienstag, 6. September 2022, 17:30–20:00, P2

Anomalous and spin Hall effect in chiral antiferromagnets Mn₃X (X=Ir, Sn, ...) — •Oliver Busch, Börge Göbel, and Ingrid Mertig — Institut für Physik, Martin-Luther-Universität, D-06099 Halle

Recently, large anomalous Hall effects (AHEs) have been measured in the non-collinear kagome antiferromagnets (AFMs) Mn₃Sn [1] and Mn₃Ge [2] and large spin Hall effects (SHEs) were predicted in such compensated Mn₃X systems [3].

We discuss the intrinsic contributions to both Hall effects of kagome AFMs via tight-binding calculations. We describe a microscopic mechanism for the occurrence of the AHE: within this model, spin-orbit coupling (SOC) is equivalent to an out-of-plane tilting of the magnetic texture [4]. Thus, the AHE can be interpreted as a topological Hall effect generated by the opening angle of the virtually tilted texture.

Besides, we find that the main contribution to the SHE in Mn₃X is a pure spin current originating from the non-collinear magnetic texture and it occurs even without SOC when the AHE is absent [5]. In addition to that, SOC gives rise to the AHE and reduces the SHE effectively which gives rise to spin-polarized currents.

[1] S. Nakatsuji, N. Kiyohara, T. Higo; Nature 527, 212 (2015)

[2] A. K. Nayak et al.; Science Advances 2, e1501870 (2016)

[3] Y. Zhang et al.; New Journal of Physics 20, 073028 (2018)

[4] O. Busch, B. Göbel, I. Mertig; Phys. Rev. Research 2, 033112 (2020)

[5] O. Busch, B. Göbel, I. Mertig; Phys. Rev. B 104, 184423 (2021)