Cunife is an

alloy An alloy is a mixture of chemical elements of which in most cases at least one is a metal, metallic element, although it is also sometimes used for mixtures of elements; herein only metallic alloys are described. Metallic alloys often have prop ...

copper Copper is a chemical element; it has symbol Cu (from Latin ) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orang ...

(Cu),

nickel Nickel is a chemical element; it has symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal. Pure nickel is chemically reactive, but large pieces are slo ...

(Ni),

iron Iron is a chemical element; it has symbol Fe () and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's o ...

(Fe), and in some cases

cobalt Cobalt is a chemical element; it has Symbol (chemistry), symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. ...

(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 valve Thermionic emission is the liberation of charged particles from a hot electrode whose thermal energy gives some particles enough kinetic energy to escape the material's surface. The particles, sometimes called ''thermions'' in early literature, ar ...

s. Fernico exhibits a similar property. It is a magnetic alloy and can be used for making

magnet A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, steel, nickel, ...

s. Cunife has a magnetic

coercivity Coercivity, also called the magnetic coercivity, coercive field or coercive force, is a measure of the ability of a ferromagnetic material to withstand an external magnetic field without becoming Magnetization, demagnetized. Coercivity is usual ...

of several hundred

oersted The oersted (, symbol Oe) is the coherent derived unit of the Magnetic field#The H-field, auxiliary magnetic field H in the CGS-EMU and Gaussian units, Gaussian systems of units. It is equivalent to 1 dyne per maxwell (unit), maxwell. Differen ...

s. Unlike most high coercivity magnetic materials which are hard and brittle and need to be

cast Cast may refer to: Music * Cast (band), an English alternative rock band * Cast (Mexican band), a progressive Mexican rock band * The Cast, a Scottish musical duo: Mairi Campbell and Dave Francis * ''Cast'', a 2012 album by Trespassers William ...

into shape, cunife can be drawn into thin wires. Wires as thin as five

thou The word ''thou'' () is a second-person singular pronoun in English. It is now largely archaic, having been replaced in most contexts by the word '' you'', although it remains in use in parts of Northern England and in Scots (). ''Thou' ...

can be produced this way. Thicker rods of the material can be threaded which is also something that is not possible with the more commonly used magnetic materials. In the early 1970s,

Fender Musical Instruments Corporation The Fender Musical Instruments Corporation (FMIC, or simply Fender) is an American manufacturer and marketer of musical instruments and amplifiers. Fender produces acoustic guitars, bass amplifiers and public address equipment; however, it is b ...

used Cunife magnets in their Wide Range

humbucker A humbucker, humbucking pickup, or double coil, is a guitar pickup that uses two wire coils to cancel out noisy interference from Single coil guitar pickup, coil pickups. Humbucking coils are also used in Microphone, dynamic microphones to can ...

pickups, however they discontinued use, due to Cunife being hard to source. Fender began producing cunife pickups again in 2020.

Typical compositions

Given in weight %

References

{{reflist

External links

National Pollutant Inventory - Copper and compounds fact sheet
Copper alloys Magnetic alloys