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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):
Therefore, as the maximum energy density is proportional to J s 2, this magnetic phase has the potential for storing large amounts of magnetic energy (BH max ≈ 512 kJ/m 3 or 64 MG·Oe). This magnetic energy value is about 18 times greater than "ordinary" ferrite magnets by volume and 12 times by mass.
Cassette tape label with coercivity (a measure of the external magnetic flux required to magnetize the tape) measured in oersteds The oersted is defined as a dyne per unit pole . [ clarification needed ] [ 6 ] The oersted is 1000 / 4π (≈79.5775) amperes per meter, in terms of SI units .
The coercivity is a measure of the degree of magnetic hysteresis and therefore characterizes the lossiness of soft magnetic materials for their common applications. The saturation remanence and coercivity are figures of merit for hard magnets, although maximum energy product is also commonly quoted.
Maximum energy product, (BH) max Largest possible field of a rectangle on the hysteresis loop plot, which has two edges on the B and H axes, and a vertex on the hysteresis loop in the second quadrant (B positive, H negative); range from below 1 J/m 3 for some soft materials (permalloy, 3E4 ferrite), to above 400 kJ/m 3 for hard ones ( neodymium ...
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]