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Ferrite (magnet)
A
ferrite
is a type of
ceramic
compound composed of
iron oxide
(Fe
2
O
3
) combined chemically with one or more additional
metallic
elements
. They are both
electrically nonconductive
and
ferrimagnetic
, meaning they can be
magnetized
or attracted to a magnet. Ferrites can be divided into two families based on their magnetic
coercivity
, their resistance to being demagnetized.
Hard ferrites
have high
coercivity
; Hence they are difficult to demagnetize. They are used to make
magnets
, for devices such as
refrigerator magnets
,
loudspeakers
and small
electric motors
.
Soft ferrites
have low
coercivity
. They are used in the electronics industry to make
ferrite cores
for
inductors
and
transformers
, and in various
microwave
components. Yogoro Kato and Takeshi Takei of the
Tokyo Institute of Technology
invented this material in 1930.
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