Chapter 1: Introduction (last change: October 16).
Chapter 2: Magnetism of free atoms and ions (last change: November 13).
Chapter 3: Diamagnetism (last change: December 12).
Chapter 4: Paramagnetism (last change: January 8).
Chapter 5: Exchange interaction (last change: February 5).
Script (all in one document) (last change: February 5).