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MA: Fachverband Magnetismus
MA 55: Non-Skyrmionic Magnetic Textures
MA 55.1: Vortrag
Donnerstag, 19. März 2020, 15:00–15:15, POT 6
Hall effects in non-collinear kagome antiferromagnets. — •Oliver Busch1, Börge Göbel1,2, and Ingrid Mertig1 — 1Institut für Physik, Martin-Luther-Universität, D-06120 Halle — 2Max-Planck-Institut für Materialforschung, D-06120 Halle
By the end of the 19th century E. Hall discovered the anomalous Hall effect that usually occurs in metals in the ferromagnetic phase. The transversal electric conductivity exists without an external magnetic field and often scales with the magnetization.
In non-collinear antiferromagnets that do not have a net magnetization an anomalous Hall effect has been predicted as well and it has been measured in Mn3Sn recently [1,2]. Furthermore it has been shown that in such materials the spin-Hall effect can exist even without spin-orbit coupling.
We examine a 2D kagome lattice considering a double-exchange s-d-tight-binding model. Our Hamiltonian includes the interaction of s electrons with non-collinear magnetic moments of a magnetic texture and spin-orbit coupling. Based on this we apply Kubo formalism to calculate the intrinsic contribution to the anomalous and spin-Hall conductivities. Furthermore we vary the magnetic moments’ in-plane and out-of-plane orientation and show the impact on both Hall conductivities.
[1] A.H. MacDonald et al., Phys. Rev. Lett., 112, 017205 (2014)
[2] S. Nakatsuji et al., Nature, 527, 212-215 (2015)