It was reported previously that in multilayer metal-polymer-metal structures magnetic properties change of any electrode may result in considerable changes in the charge transport through the polymer film. Magnetic properties changes were realized by variation of the sample temperature near the Curie point.
The purpose of this work was to find conditions for charge transport control in a ferromagnet-polymer-metal system with the aid of the external magnetic field. In organization of the experiment we proposed that electroactive polymer transport properties were defined by the surplus charge (electron) and macromolecule functional groups interaction. The probability of the interaction depends on the spin orientation of the injected electron. One can control the spin orientation by the external magnetic field influence over the ferromagnetic electrode domain structure.
Polycrystalline nickel was used as the ferromagnet; poly(phtalidilidenbyphenililene) (PPB) as the electroactive polymer. For less magnetostrictive effects (tensions) in the magnetic sample it was chosen as a plate placed normally to the magnetic field force lines. The conducting state of the system was chosen as the initial one. With magnetic field increase up to ~150 mT we see great current fluctuations. At 160 mT the current decreases down to a minimal value and the sample transfers to the low-conducting state. The resistance changes by four orders of magnitude. With the magnetic field decrease we see the return of the conductance to the initial state under less magnetic field values ~ 148 mT. It was noticed that the field values under which one can see changes of the system conductivity depended on the sample history. The minimal field value under which we could see the changes was ~ 20 mT. For the results analysis magnetization curves of the samples were obtained and various charge transport parameters. The polymer thickness and initial conductivity value influences were also investigated.

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