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For this question What does the magnetic moment of a quantum particle depend on? was given such statement:

The magnetic moment of ... an electron, is intrinsic, and related to spin.

Isn't the spin only a synonym for the existence of a magnetic dipole moment and its direction?

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    $\begingroup$ "Isn't the spin only a synonym for the existence of a magnetic dipole moment and its direction?"...why would you think it is? $\endgroup$ – ACuriousMind Mar 23 '17 at 13:12
  • $\begingroup$ @ACuriousMind give please an example of phenomena where the magnetic dipole moment couldn't exchanged by spin. $\endgroup$ – HolgerFiedler Mar 23 '17 at 17:58
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    $\begingroup$ @Holger that's completely backwards - to disapprove the assertion in the OP what you need is a phenomenon where the spin cannot be exchanged for a magnetic moment, of which there are plenty. $\endgroup$ – Emilio Pisanty Mar 23 '17 at 19:08
  • $\begingroup$ Spin contributes to the centrifugal force in hydrogen atoms. It is a mechanical effect. See also: physics.stackexchange.com/questions/370298/… $\endgroup$ – my2cts Jul 11 '18 at 20:29
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No. The spin of quantum particles is indeed an angular momentum, and it can be changed over into orbital angular momentum if the circumstances are right. The Einstein-de Haas effect is the canonical example of this.

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    $\begingroup$ Spin also has profound physical effects not associated with magnetic fields. You know, little things like the periodic table and other important features of chemistry; and the behavior of solids. $\endgroup$ – dmckee Mar 23 '17 at 19:04

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