Alnico
Alnico alloys can be made magnets by strong magnetic fields. Rare-earth magnets like neodymium and samarium-cobalt are the only easily found magnets which are stronger than alnico magnets. Alnico magnets produce very strong magnetic fields at their poles (a pole is one of the two ends of a magnet) as high as 1500 gauss (0.15 tesla which is about 3000 times stronger than earth's magnetic field.