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The maximum energy product is defined based on the magnetic hysteresis saturation loop (B-H curve), in the demagnetizing portion where the B and H fields are in opposition. It is defined as the maximal value of the product of B and H along this curve (actually, the maximum of the negative of the product, −BH, since they have opposing signs):
The stored energy in a magnet, called magnet performance or maximum energy product [12] (often abbreviated BH max), is typically measured in units of megagauss-oersteds (MG⋅Oe). See also [ edit ]
The saturation remanence and coercivity are figures of merit for hard magnets, although maximum energy product is also commonly quoted. The 1980s saw the development of rare-earth magnets with high energy products but undesirably low Curie temperatures. Since the 1990s new exchange spring hard magnets with high coercivities have been developed ...
is the maximum energy product in units of J/m 3 (Joules per cubic meter) is the normal distance between the two parallel faces of the magnets; is the distance between the magnetic dipole axes of the two magnets.
Neodymium magnets are graded according to their maximum energy product, which relates to the magnetic flux output per unit volume. Higher values indicate stronger magnets. For sintered NdFeB magnets, there is a widely recognized international classification.
A magnet's maximum energy product (BH) max, which is roughly proportional to its coercivity (H C) and magnetization saturation (M sat), is used as a metric of its ability to do magnetic work as (BH) max is twice the magnet's available magnetostatic energy. [3] The exchange spring magnet offers a geometry able to improve upon the previously ...