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Further reading:

spin magnetic moment

Genaral information on “Electron spin – anticlockwise rotation”

(Attention, this is not a exact view of quantum physics)

Electrons, as negatively charged particles, not only rotate about the core of atom but also about their own axis (spin). This motion creates a magnetic field around the electrons. In anticlockwise rotation, the North pole of the field is at the top and the South pole at the bottom. This fact is important if an external magnetic field is applied.

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