Ferrite (magnet)

A ferrite is one of a family of iron-oxide-containing magnetic ceramic materials. They are ferrimagnetic, meaning they are attracted by magnetic fields and can be magnetized to become permanent magnets. Unlike many ferromagnetic materials, most ferrites are not electrically-conductive, making them useful in applications like magnetic cores for transformers to suppress eddy currents.

Ferrites can be divided into two groups based on their magnetic coercivity, their resistance to being demagnetized:

"Hard" ferrites have high coercivity, so are difficult to demagnetize. They are used to make permanent magnets for applications such as refrigerator magnets, loudspeakers, and small electric motors.