Although natural magnets, called stone magnets, have always existed, compound magnets made of alloys of different materials are now being produced. They are made of
Alnico (Aluminum, Nickel and Cobalt),
Ferrite (iron oxide, boron oxide and strontium oxide),
Neodymium (Neodymium, iron and boron). They are called
permanent magnets. Read more on this article ....