Kittel's theorem

Kittel's theorem states that in certain complex magnetic materials composed of multiple magnetic phases or domains, the overall magnetic behavior can be understood as an average of the individual parts’ behaviors. This means that the total magnetic properties can be approximated by combining the properties of each phase, weighted by their proportions, as if each acted independently. This simplifies analyzing composite magnetic materials by allowing researchers to predict their overall response based on the known behaviors of each component, rather than dealing with complicated interactions between phases.