Some ferromagnetic elements are:
Iron
Nickel
Cobalt
Gadolinium
Dyprosium
Ferromagnetic means- a substance such as iron in which the magnetic moments of the atoms spontaneously line up with each other, making a large net magnetic moment. Ferromagnets lose their ferromagnetism when heated above a specific temperature (called the Curie point), because the thermal energy melts the magnetic alignment, a bit like the way crystals melt when heated.