Spin-polarized transport through the magnetic polyacetylene (poly-BIPO) in the presence of a soliton spin density distribution is numerically investigated in the metal/poly-BIPO/metal model junction. The study was performed using the modified Su–Schrieffer–Heeger Hamiltonian with the extended Hubbard model for the electron–electron interaction in the case of finite electron correlation. The spin transport properties were calculated within the framework of Green’s function theory and Landauer– B¨uttiker formalism. Our results indicate that the presence of neutral solitons gives rise to the extension of spin density distribution which induces the extended soliton states in the middle of an energy gap of the molecule such that the band gap width of the molecule reduced It is also shown that the spin transport depends on the relative direction of the spin of soliton and the spin of radicals, and also, the maximum polarization happens when the spin direction of the radicals and soliton is in the opposite directions.

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