Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 34: Functional Antiferromagnetism
MA 34.6: Vortrag
Donnerstag, 8. September 2022, 16:15–16:30, H48
Correlation of Atomic Disorder and Anomalous Hall Effect in a Non-Collinear Antiferromagnet — •Berthold H. Rimmler1, Binoy K. Hazra1, Holger L. Meyerheim1, Arthur Ernst2, and Stuart S. P. Parkin1 — 1Max Planck Institute for Microstructure Physics, Weinberg 2, 06120 Halle, Germany — 2Johannes Keppler University, Altenbergerstrβe 69, Linz 4040, Austria
Non-collinear antiferromagnets (NCAFs) such as the well-studied alloy Mn3Sn have compensated triangular magnetic structures with vanishing net magnetization. Due to magnetic symmetry breaking, they can display a large Anomalous Hall Effect (AHE). Measurement of the AHE requires an imbalance of antiferromagnetic domains. Domain structure control by magnetic field or spin torques is possible in Mn3Sn, because crystalline anisotropy induces weak canted moments. In contrast, these moments are not intrinsic to cubic NCAFs. In this work, we investigate the crystallographic, magnetic and magneto-transport properties of thin films of the cubic NCAF Mn3SnN. We find that the manganese atoms can be displaced from their high-symmetry positions. This atomic site disorder correlates with a finite AHE. We employ ab-initio calculations to show that the manganese site displacement can induce canting. In analogy to Mn3Sn, these canted moments may allow for domain structure control leading to the observed AHE. This work provides new insight into the microscopic origin of canted moments in cubic NCAFs and their correlation with the AHE. Our findings have implications for other magneto-transport effects such as the anomalous Nernst effect or the spin Hall effect.