Spin polarized injection and transport in organic polymers

Organic spintronics has been an attractive topic since the experiment in which injection of spin polarized electrons from ferromagnetic metals (FM) into organic polymers was reported. By considering both the spin polarons and spinless bipolarons as carriers in organic polymers, we studied the spin injection into organic polymers from both an electrocircuit model and the diffusion theory separately. It was found that a high current polarization could be obtained by adjusting the proportion of the polarons over the carriers. Effect of conductivity matching of the FM layer and the polymer layer on the spin injection was discussed.