What is sp-d exchange interaction?

The sp-d exchange interaction refers to the coupling between the spins of conduction electrons (typically from s and p orbitals) and localized d electrons in transition metal systems. This interaction plays a crucial role in determining the magnetic properties of materials, influencing phenomena such as ferromagnetism and antiferromagnetism. The strength and nature of the sp-d exchange can affect the alignment and behavior of magnetic moments in materials, impacting their overall magnetic performance.