Oral: Topological features in Non-Collinear Mn₂Rh_1-xIr_xSn Heusler Magnet

Non-collinear magnetism has emerged as a fundamental and experimentally intriguing aspect of magnetism as one of the most non-trivial aspects because of novel topological spin textures (skyrmions) and its potential applications in spintronic devices [1]. Within this scope, experimental observations of a noncollinear magnetic ground state in the inverse tetragonal Heusler Mn₂RhSn [2] triggered the search of new emergent phenomena in this family of compounds. The structural, magnetic, and electrical transport properties of the inverse tetragonal Mn₂Rh_1-xIr_xSn (0 < x < 0.4) have shown an enhancement of perpendicular magnetic anisotropy, finding experimental evidence that the Ir substitution enhance the anomalous hall conductivity suggesting a predominant intrinsic Berry-curvature contribution [3,4]. In this work, we employed first-principle calculations to determine the noncollinear ground state, providing profound insights into exchange interactions by analyzing the electronic structure, topological features, and spin texture. Our study elucidates the enhancement of anomalous Hall conductivity, as well as topological phase transitions based on exchange interactions and Berry-curvature. Additionally, we theoretically explored the competing magnetic interactions influenced by Iridium substitution and how these features change as a function of Ir concentration.