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Nanowires consisting of regioregular poly(3-butylthiophene) (P3BT) were prepared using o-dichlorobenzene. The magnetic processing of the nanowires was carried out using a superconducting magnet in the vertical (B max ¼ 10 T) direction. The formation of the nanowires was confirmed by atomic force microscopy (AFM). The polarized absorption spectra of the nanowires on a glass plate in the absence and presence of a magnetic field indicated that the nanowires partly oriented in the presence of magnetic fields (6 and 10 T). The magnetic orientation is most likely attributable to anisotropy in the magnetic susceptibility of the ordered P3BT in the nanowires. The AFM images of the nanowires on mica and the polarized absorption spectra of the nanowires on glass plates indicate that the nanowires partly oriented themselves with their long axes, which are perpendicular to the -stacking direction, parallel to the magnetic field. #

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