Exchange Interaction: Isotropic and Magnetic Field Interpretation

This lecture covers the isotropic nature of exchange interaction in materials, explaining how amorphous and crystalline samples can exhibit ferromagnetic behavior. It delves into the role of interatomic distances, Coulomb interaction, and critical temperature in determining the exchange constant. The lecture also discusses the cooperative phenomenon of magnetization resulting from tiny moments and the interpretation of exchange interaction as an additional magnetic field aligning spins.