"Ferromagnetism" referrs to magnets made of iron.

Domains are regions with a common magnetic field.

In the presence of an external field, domain boundaries will move so that more domains that are near the direction of the external field will increase in size. This greatly increases the magnetic field of the material.

Magnetic Fields

Force on an Electric Charge

Return to Ch 20, Magnetism
(c) Doug Davis, 2003; all rights reserved