Exotic magnetoelectric interactions in Co²⁺-based quantum materials

3d transition metal magnetic ions usually exhibit fully quenched orbital angular momentum due to the strong influence of the crystal electric field. Nevertheless, Co²⁺ ions in certain oxygen coordinations exceptionally show considerable orbital contribution and large spin-orbit entanglement, making them promising candidates for building quantum materials with significant magnetoelectric interactions. In this talk, I will introduce my research on the design, synthesis, and characterization of ferroic orderings and their novel interplays of previously unexplored Co²⁺-based quantum materials. The crucial role of advanced facilities like neutron and synchrotron scatterings in investigating quantum materials will also be emphasized.