Relativistic derivation of coupled spin-orbital angular momentum dynamics in magnetic systems, with total J conserved under Heisenberg exchange even in the presence of electromagnetic fields.
The orbital angular moment is hence taken as a local, atom-centered quantity (and not as an extended itinerant quantity [96])
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Relativistic theory for coupled orbital and spin angular momentum dynamics in magnetic systems
Relativistic derivation of coupled spin-orbital angular momentum dynamics in magnetic systems, with total J conserved under Heisenberg exchange even in the presence of electromagnetic fields.