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In addition to the normal classification of magnetism types viz. Ferro, Ferri, Antiferro, Para and Dia, numerous subclassifications also exist. Some of them are listed below
The abrupt transition from antiferromagnetic to ferromagnetic at constant temperature is metamagnetism
A magnetic state in which localized moments of a given species are locked into random orientation, with no net magnetization nor regular pattern of local ordering beyond nearest neighbours is called speromagnetism.
A magnetic state formed from randomly placed localized moments of a given species, locked in various orientations below some ordering temperature, To but with some orientations more likely than the others, is called asperomagnetism. It could occur in amorphous form with a net magnetization.
A magnetic state formed from ordered, localized moments on a crystalline lattice, locked in different orientations belwo some ordering temperature but with some orientations more likely than the rest, can be called helimagnetism. It is the crystalline form of aspermagnetism.
5) Incipient ferromagnetism
A metal in which the exchange coupling of itinerant electron magnetism is not quite sufficient to produce the long-range order of ideal ferromagnetism.
6) Ideal Spin Glass
A crystalline alloy comprising magnetic ions of a given species incorporated inot a nonmagnetic host can order speromagnetically when cooled below a critical temperature.
Similar to ideal spin glass except that the local correlation of the magnetic ions are dominant generally because the concentration of the magnetic solute has been increased sufficiently.
Comprises of two or more magnetic species with the moments of at least one species frozen in random orientations.