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In electromagnetism, the magnetic moment or magnetic dipole moment is the combination of strength and orientation of a magnet or other object or system that exerts a magnetic field. The magnetic dipole moment of an object determines the magnitude of torque the object experiences in a given magnetic field. When the same magnetic field is applied ...
Magnetic moment, magnetic dipole moment: m, μ B, Π: Two definitions are possible: using pole strengths, = using currents: = ^ a = pole separation N is the number of turns of conductor A m 2 [I][L] 2: Magnetization: M
The magnetic moment would later be explained in quantum theory by the Bohr magneton (), which is used in the Brillouin function. It could be noted that there is a difference in the approaches of Langevin and Bohr, since Langevin assumes a magnetic polarization μ {\displaystyle \mu } as the basis for the derivation, while Bohr start the ...
However, the effect of a torque applied to an electron's magnetic moment must be considered in light of spin-orbit interaction.Because the magnetic moment of an electron is a consequence of its spin and orbit and the associated angular momenta, the magnetic moment of an electron is directly proportional to its angular momentum through the gyromagnetic ratio, such that
The total magnetic dipole moment resulting from both spin and orbital angular momenta of an electron is related to the total angular momentum J by a similar equation: = . The g -factor g J is known as the Landé g -factor , which can be related to g L and g S by quantum mechanics.
The magnetization field or M-field can be defined according to the following equation: =. Where is the elementary magnetic moment and is the volume element; in other words, the M-field is the distribution of magnetic moments in the region or manifold concerned.
The magnetic moment of an object is an intrinsic property and does not change with distance, and thus can be used to measure "how strong" a magnet is. For example, Earth possesses an enormous magnetic moment, however we are very distant from its center and experience only a tiny magnetic flux density (measured in tesla ) on its surface.
The magnetic moment, also called magnetic dipole moment, is a measure of the strength of a magnetic source. The "Dirac" magnetic moment, corresponding to tree-level Feynman diagrams (which can be thought of as the classical result), can be calculated from the Dirac equation. It is usually expressed in terms of the g-factor; the Dirac equation ...