Masters Thesis Defense by Magnus Boutrup Lyngby

Abstract: The field of odd-parity magnetism has recently undergone a surge in popularity, as new ways of understanding odd-parity spin-split bands have emerged. In this thesis, we first give a short introduction to magnetism, focusing on odd-parity magnetism and its physical properties. Next we develop a minimal model of odd-parity magnets, relevant for CeNiAsO. We then go over the group theory of odd-parity magnets, showing a simple recipe for building odd-parity magnetic structures. We then show that the material CeNiAsO falls under this classification. Itinerant magnetism is then introduced, and arguments by Lee & Brydon (2025) giving an itinerant model of odd-parity magnetism are summarized and checked numerically. We go over magnetic susceptibilities, and why a simple treatment of these is insufficient to explain odd-parity magnetism. Finally we calculate a non-relativistic linear Edelstein effect for our minimal model of CeNiAsO, as well as the Berry curvature for Class 2 scalar odd-parity magnets.