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What is “spread of magnetization”?
Some people may don’t know spread of magnetization, may think it as the consistency of Br value or surface gauss value or the magnetization angle error. It is the spread of the component of magnetization vector (it's module is Br/(mu0)) along the direction of the thickness edge, averaged over the magnet volume. It usually can be measured by two methods. One is to measure the field far (about 1 m) from the magnet and then to calculate its total dipol magnetic moment. Typically it can be fixed to the hall probes at some positions and use a guide detail to install each testing magnet in the same position. Another one also measures the interesting component of the total dipole magnetic moment vector by inserting the magnet into the special solenoidal coil and integrating the voltage on coil over time.
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