Hard Ferrite (ceramic) magnets, composed of barium or strontium,
were developed in the early.
1960's as an alternative to the more expensive metallic magnets.
This class of magnet is very hard, brittle and possesses lower
characteristics compared to other magnetic materials. However, it
is very popular and widely used because of its excellent resistance
to demagnetization, corrosion, and the advantageous pricing.
Ferrite magnets are manufactured by pressing, sintering, or
injection molding. These magnets can be both anisotropic and
Anisotropic grades are oriented in the manufacturing direction and
must be magnetized in the direction of orientation. Isotropic
grades are not oriented and can be magnetized in any direction.