Abstract

Instead of spin electrons or holes, the carriers in polymers are supposed to be spin polaronsor spinless bipolarons. Based on the spin diffusion theory and Ohm’s law, we studiedspin-polarized injection into organic polymers. It was obtained that only spin polarons areresponsible for the current spin polarization in a ferromagnetic (FM)/organic system.Effects of the conductivity matching and the interfacial resistances on the current spinpolarization were discussed.

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