It manifests when the two partial 3d bands of opposite spin are shifted by exchange interactions, but only when the band width is comparable to the displacement.  It is favored when the ratio of half the nuclear separation to the 3d radius is greater than 1.5, though Heusler alloys with manganese also exhibit this as an exception to the rule.  Found when the difference in energy between magnetized and unmagnetized states is near a 10th of an electron volt, it is characterized by domain structure and irreversibility upon
It manifests when the two partial 3d bands of opposite spin are shifted by exchange interactions, but only when the band width is comparable to the displacement.  It is favored when the ratio of half the nuclear separation to the 3d radius is greater than 1.5, though Heusler alloys with manganese also exhibit this as an exception to the rule.  Found when the difference in energy between magnetized and unmagnetized states is near a 10th of an electron volt, it is characterized by domain structure and irreversibility upon magnetic field application known as the hysteresis effect.  FTP name this condition below the Curie point, the basis for permanent magnets like iron.
It manifests when the two partial 3d bands of opposite spin are shifted by exchange interactions, but only when the band width is comparable to the displacement.  
Ferromagnetism