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Abstract
The article investigates the acqusition, structure, magnetic properties and magnetoresistance effect of nanocomposites on the basis of polypropylene matrix and iron nanoparticles, structure, magnetic properties and magnetoresistance. AFM results illustrate that the increase in the volume content of Fe nanoparticles in the polymer matrix causes changes on its supramolecular structure. As a result of the MFM studies, it has been defined that, nanoparticles dispersed in the polymer matrix form domains in the local areas and the sizes of domains vary from 150 to 400 nm. The study of magnetic properties of PP + Fe based nanocomposites showed that intrinsic magnetization increases with increasing magnetic field intensity and saturation occurs at certain value of intensity. If the field is reduced, remanent magnetization and hysterezis loop is observed. The dependence of PP + Fe based nanocomposites on the magnetic field was investigated and magnetoresistive effect was observed and it was found to be related with the presence of tunneling magnetoresistance effect in these nanocomposites.