This property occurs below the Curie point, and materials displaying it have a high positive susceptibility, and often retain their magnetization in the absence of an external magnetic field, which is known as hysteresis.
The existence of this property can be predicted using the Stoner criterion, and a material with this property changes under torsion according to the Matteucci effect. One model of this phenomenon was solved in two dimensions by Lars Onsanger and was generalized by Potts. One process in materials with this property occurs in many small discontinuous steps, and results in Barkhausen noise. This property occurs below the Curie point, and materials displaying it have a high positive susceptibility, and often retain their magnetization in the absence of an external magnetic field, which is known as hysteresis. FTP name this type of magnetism possessed by cobalt and nickel, as well as iron, its namesake.
The existence of this property can be predicted using the Stoner criterion, and a material with this property changes under torsion according to the Matteucci effect.
{ferromagnetism}