Georgia State University
Georgia State University: Hyper Physics: Magnetic Domains
A great introduction to magnetic domains, including pictures which illustrate the effect on domains caused by external applied magnetic fields.
National High Magnetic Field Laboratory
Magnet Academy: Magnetic Domains
In ferromagnetic materials, smaller groups of atoms band together into areas called domains, in which all the electrons have the same magnetic orientation. That's why you can magnetize them. See how it works in this Java tutorial.
CK-12 Foundation
Ck 12: Properties of Magnets
[Free Registration/Login may be required to access all resource tools.] Looks at magnetic materials and the structure and breadth of a magnetic field. The concept of magnetic domains is explained, and how they behave in a magnetic field....
McGraw Hill
Mhhe: Chapter 19 Magnetism
A series of pages which define key terms and explain basic concepts related to magnetism. A set of practice problems with answers and solutions are given. Links to related internet resources and a list of animations are provided.
Georgia State University
Georgia State University: Hyper Physics: The Curie Temperature
A brief definition of the Curie temperature for ferromagnetic materials.
Wikimedia
Wikipedia: Ferromagnetism
This site from Wikipedia provides a wonderful in-depth explanation of ferromagnetism, covering the atomic behavior which is responsible for ferromagnetic properties. Also introduces the concepts of magnetic domains and the Curie...
Other
Ndt Resource Center: Magnetic Domains
This site is an introduction to magnetic domains, including a picture showing distinct domains taken through a process called "Magnetic force microscopy."