This property is characterized by the presence of magnetic properties even after the removal of an external magnetic field, a behavior which ceases above the Curie temperature.
The Ising model deals with this behavior microscopically by considering electrons interacting only with nearest neighbors in a lattice of spin states. Materials with this property exhibit a lag response with changes in an applied field, a phenomenon called hysteresis. This property is characterized by the presence of magnetic properties even after the removal of an external magnetic field, a behavior which ceases above the Curie temperature. For 10 points name this type of magnetism exhibited by such metals as nickel, cobalt, and its namesake, iron.
The Ising model deals with this behavior microscopically by considering electrons interacting only with nearest neighbors in a lattice of spin states.
{ferromagnetism} [accept word forms like {ferromagnet}, etc.; accept {hysteresis} until mentioned]