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Alnico (composed of alloys Aluminum, Nickel and Cobalt) magnets were invented in the
1920s. They are used today in high temperature applications, in applications which
require low coercivities (the ability to demagnetize and re-magnetize easily), or in mass produced instruments and legacy applications where the
material has been designed in. On a cost per pound basis, this material is comparable to
the cost of Neodymium magnets, although they are in most applications much less
powerful than Neodymium magnets. Alnico magnets are manufactured through either a
casting or sintering process. Cast magnets can be made in fairly complex shapes -
such as the shape shown below - a 4-pole round horseshoe magnet.
· ° F - 90% of room temperature magnetization is retained up to this temperature. High residual induction - Alnico magnets can produce powerful fields in certain configurations. Material does not corrode. Cast Alnico magnets can be produced in relatively complex shapes. Tooling for cast magnets is relatively low, since sand molds are generally used for
the casting process.
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