The effects of electron–phonon (e–p) interactions, on the transport properties, electrical conductivity, current–voltage characteristic and tunneling magneto resistance (TMR) of the Al12N12 molecule are investigated here. Besides, the influences of the temperature and magnetic field are also included. According to the results, electrical conductivity, current–voltage characteristics and TMR of Al12N12 molecule change at the presence of e–p interaction in the situation of single, four and six-atom contacts. Besides, considering the spin degrees of freedom it is shown that the current increases and the TMR behavior changes at the zero bias voltage. The electrical conductivities for the parallel ( $$ \downarrow \downarrow \,{\text{or}}\, \uparrow \uparrow ) $$ and antiparallel ( $$ \uparrow \downarrow \,{\text{or}}\, \downarrow \uparrow ) $$ spins of the six-atom contacts are larger than the single and four-atom contacts.
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