Weiss's Theory of Ferromagnetism - The Incredible Truth
- A specimen of ferromagnetic material contains a number of small regions called domains which are spontaneously magnetized. The magnitude of the spontaneous magnetization is given by the vector sum of the magnetic moments of individual domains.
- The spontaneous magnetization of each domain is due to the pressure of an exchange field, BE, which tends to produce a parallel alignment of the atomic dipoles.
BE = λM
λ = Weiss field constant
BE = Weiss field
M = Spontaneous magnetization