1) Ferromagnetic material 
Fernico describe a family of metal alloys made primarily of iron, nickel and cobalt. The family includes Kovar, FerNiCo I, FerNiCo II, and Dumet. The name is made up of the chemical symbols of its constituent three elements. `Dumet` is a portmanteau of `dual` and `metal,` because it is a heterogeneous alloy, usually fabricated in the form of...