Alnico

noun

1. Any of several hard, strong alloys of iron, aluminum, nickel, cobalt and sometimes copper, niobium, or tantalum, used to make strong permanent magnets.
2. An alloy of aluminium, nickel and cobalt (named for their chemical symbols Al, Ni and Co respectively), sometimes alloyed with smaller amounts of iron, copper, titanium and used primarily in the manufacture of magnets.
3. trade name for an alloy used to make high-energy permanent magnets; contains aluminum and iron and nickel plus cobalt or copper or titanium