As the intrinsic property of magnetic material, its magnetic properties are depending heavily on the composition and microstructure, and independent of the shape and dimension. However, magnetic properties which affected by shape and dimension obtain more attention from users in actual use, also known as the comparative measurement of magnetic property. Regular comparative measurement method includes magnetic field strength, flux density and magnetic moment.

The value of magnetic moment is related to remanence, dimension and Pc value of magnet. In fact, test coil and operation method should be also considered. Flux density can be converted to magnetic moment by below formula:

For high coercivity permanent magnet, its dimension getting smaller, and shape is also getting more complicated, thus difficult to test performance via Gaussmeter and Fluxmeter. In this case, magnetic moment is sensible choice to collect accurate value with good repeatability.

How to test Magnetic Moment?

Helmholtz coil and Fluxmeter will be utilized to test magnetic moment of the permanent magnet. The output signal of Helmholtz will transmit to Fluxmeter directly. Place saturated magnet to the central area of coil, then take magnet out after zero Fluxmeter.

Another Application of Magnetic Moment

The magnetic properties of the permanent magnet can be obtained through the demagnetization curve. Actually, magnetic moment is also a quick and convenient way to derive operating point, coercivity, remanence and Max. Energy Products. Although its accuracy can’t compare with hysteresisgraph measurement, but its facility cost is substantially less.