define spin magnetic moment
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When electrons move around freely, they create a magnetic field; this magnetic field created by electron motion is known as the magnetic moment. A spin-only magnetic moment occurs when an electron rotates on its own axis and generates a magnetic field.
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In physics, mainly quantum mechanics and particle physics, a spin magnetic moment is the magnetic moment caused by the spin of elementary particles. For example, the electron is an elementary spin-1/2 fermion. Quantum electrodynamics gives the most accurate prediction of the anomalous magnetic moment of the electron.