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It is shown that in organic semiconductors where organic magnetoresistance(OMAR) is observed, the exchange interaction between electrons and holeslocalized at different molecules leads to dynamic spin polarization in thedirection of the applied magnetic field. The polarization appears even at roomtemperature due to the non-equilibrium conditions. The strong spin polarizationrequires exchange energy to be comparable with Zeeman energy in the externalfield and be larger or comparable with the energy of hyperfine interaction ofelectron and nuclear spins. The exchange interaction also modifies thelineshape of OMAR.

Dynamic spin polarization in organic semiconductors with intermolecular exchange interaction