Cunife

Cunife is an alloy of copper (Cu), nickel (Ni), iron (Fe), and in some cases cobalt (Co).

The alloy has the same linear coefficient of expansion as certain types of glass, and thus makes an ideal material for the lead out wires in light bulbs and thermionic valves.

Cunife has a magnetic coercivity of several hundred oersteds.

Unlike most high coercivity magnetic materials which are hard and brittle and need to be cast into shape, cunife can be drawn into thin wires.

[2] In the early 1970s, Fender Musical Instruments Corporation used Cunife magnets in their Wide Range humbucker pickups, however they discontinued use, due to Cunife being hard to source.