Néel vector controlled exceptional contours in <i>p</i>-wave magnet-ferromagnet junctions

Abstract Non-Hermitian (NH) systems can host exceptional degeneracies where not only the eigenvalues, but also the corresponding eigenvectors coalesce. Recently, p -wave magnets have been introduced, which are characterized by their unusual odd parity. In this work, we propose the emergence of NH degeneracies at the interface of p -wave magnets and ferromagnets. We demonstrate that this setup offers a remarkable tunability allowing realization of exceptional lines and rings, which can be controlled via the orientation of the p -wave Néel vector. We present the origin of these exceptional contours based on symmetry, and characterize them using phase rigidity. Our works puts forward a versatile platform to realize controllable NH degeneracies at odd parity magnetic interfaces.