SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 31: Functional Antiferromagnetism II

MA 31.6: Vortrag

Mittwoch, 29. März 2023, 16:30–16:45, HSZ 04

Anomalous Hall Effect in Antiperovskite Nitride Thin Films Driven by Structural Disorder — •Berthold H. Rimmler, Binoy K. Hazra, Holger L. Meyerheim, and Stuart S. P. Parkin — Max Planck Institute of Microstructure Physics, Halle

Antiperovskites display unusual properties such as complex magnetism, superconductivity, negative thermal expansion and distinct magneto-transport effects, which render them interesting for various applications. For instance, Mn-based antiperovskite nitrides, Mn3ZN (Z = Ni, Ga, Sn), have attracted attention in spintronics, as they can host non-collinear antiferromagnetism and other complex magnetic phases. These give rise to unusual intrinsic magneto-transport effects, such as the anomalous Hall effect in absence of magnetization or the spin Hall effect where spin currents display arbitrary spin polarization directions. Control of the antiferromagnetic domain structure in these materials is essential for using these effects in spintronic devices. Therefore, an imbalance of the otherwise fully compensated non-collinear antiferromagnetic textures is required. Previously, strain-driven tetragonal distortion was assumed to be the mechanism allowing for domain control. In this work we show, by comparison of different Mn-based antiperovskite nitrides and using advanced X-ray diffraction measurements, that domain structure control is, instead, enabled by displacements of Mn atoms out of high symmetry positions that locally break the global crystal and magnetic symmetry. We demonstrate that this effect is a general feature of a number of Mn3ZN compounds and might, therefore, also have implications for other antiperovskites.