Magnetic dipole moment: The moment associated with a magnetic dipole called magnetic dipole moment. If the pole strength of a bar magnet is ‘m’ and the magnetic length is 2l, then magnetic dipole moment M = m x 2l. Unit of magnetic moment is Am-1. The dipole component of an object’s magnetic field is symmetric about the direction of its magnetic dipole moment and decreases as the inverse cube of the distance from the object.
The magnetic moment (µ) is a vector quantity used to determine the tendency of an object to interact with an external magnetic field. In NMR, the object of interest is usually a molecule, atom, nucleus, or subatomic element. The object’s basic magnetic properties are often visualized as emanating from a tiny bar magnet with north and south poles (the “dipoles”), and is therefore also called the magnetic dipole moment.