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This lecture covers the basics of magnetic interactions, starting from atomic scale to bulk materials, explaining the origin of exchange interactions in particles, ordering temperatures in ferromagnets and antiferromagnets, and the role of dipolar interactions and shape anisotropy in magnetization. It also delves into the significance of exchange breaking layers in magnetic recording technology, the impact of lattice structures on dipolar interactions, and the magnetization states for in-plane and out-of-plane magnetized particles.