A permanent magnet is that a magnet that is permanent, in contrast to an electromagnet,which only behaves like a magnet when an electric current is flowing through it.
Permanent magnets are made out of substances like magnetite (Fe3O4),
the most magnetic naturally occurring mineral or neodymium, Samarium cobalt, a powerfully magnetic synthetic substance.Magnetic Characteristicsof N40SHGRADERemanenceCoercive ForceIntrinsic CoerciveMax Energy ProductWorking Temp.(Br)(bHc)(iHc)(BH)maxTw(ºC)TKGsKA/mKOeKA/mKOeKJ/m³MGOeN40SH1.26-1.3112.6-13.1≥923≥11.6≥1592≥20302-32638-41≤150