Faraday balance

The pole pieces of the magnet are shaped so that there is a region in which the product of the field strength and the field gradient in the z direction is constant; the sample to be measured is placed in this region.

The force in this case is independent of the packing of the sample and depends only on the total mass of the material present.

The method is sensitive and highly reproducible, and can be applied to single crystals.

An alternative method for measuring magnetic susceptibility is the Gouy balance.

However, errors caused by inefficient packing in the sample tube are difficult to eliminate.