Domain Walls in Magnetic Materials

This lecture discusses the concept of domain walls in magnetic materials, focusing on the energy considerations and characteristics inside the walls. It covers the exchange energy, Curie temperature, anisotropy energy, lattice spacing, domain-wall thickness, and energy. The lecture also explores the magnetic properties of iron, cobalt, and nickel, including saturation magnetization and anisotropy energy. The instructor presents the processes for domain reversal, such as domain rotation and wall displacement, emphasizing irreversible and reversible movements.