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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):
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 .
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.
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.
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 ...
The magnetic moment of a bulk material is the sum of all of its atomic moments. The atomic moments' interactions with each other and with the externally applied field determine the behavior of the magnet. Each atomic magnetic moment tries to orient itself so that the total magnetic energy reaches a minimum.
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The magnetic field (marked B, indicated by red field lines) around wire carrying an electric current (marked I) Compass and wire apparatus showing Ørsted's experiment (video [1]) In electromagnetism, Ørsted's law, also spelled Oersted's law, is the physical law stating that an electric current induces a magnetic field. [2]