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Article | REF: E1730 V3

Ferromagnetism at the nanoscale

Authors: Hélène BEA, Liliana D. BUDA-PREJBEANU

Publication date: August 10, 2018, Review date: October 23, 2020

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1. Quantum origin of magnetism

1.1 Magnetic moment

The magnetism of atoms results from the movement of electrons, which induce an orbital magnetic moment, associated with their revolution around the nucleus, and a spin magnetic moment, associated with their rotation on themselves. . The total magnetic moment is the vector combination of orbital and spin moments. The order of magnitude of the atomic magnetic moment is the Bohr magneton, defined by :

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