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 Definition Magnetic moment per unit volume of a material, denoted M, defined in terms of the magnetic moments of its constituents by M=(1/V)Σj mj where the magnetic moment mj of the j-th constituent in the volume V is a vector property that determines the torque the object experiences in a magnetic field tending to align its moment with the field. [d] [e]

Needs more work

This article requires some examples, and some sources. John R. Brews 17:49, 9 December 2010 (UTC)

B and H

Authors are sloppy about the use of B and H. It appears that serious calculations of magnetic susceptibilities, Kubler for example use H and find it self-consistently inside the material. Because it is a self-consistent calculation, and so involves adjustable parameters, it is moot what the exact interpretation of H may be, but M = χH with χ dimensionless makes H the way to go. The only role left to B is outside the material where B = μ0H because M = 0, and then the role of B is just to establish the external applied H. John R. Brews 16:44, 13 December 2010 (UTC)