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Magnetic phase consisting of a-Fe particles arranged in a thin near-surface layer has been synthesized in modified phosphorus-containing polymethylmethacrylate by Fe + implantation at an energy of 40 keV with a dose of 1.2-10 ~y ion/cm z. The spectrum of magnetic resonance of the obtained samples is a superposition of a wide anisotropic absorption line anda set of reproducible lowintensity noiselike signals registered in a wide range of magnetic field. It has been established that a wide absorption line is due to particle conglomerates (larger than 200 nm), each behaving asa thin ferromagnetic film. Noiselike lines can be explained as resonance signals from separate oblate/ prolate nanoparticles (50-200 nm in size) randomly oriented with respect to the irradiated surface. Such complicated nanostructures can be formed at ah appropriate combination of properties of a polymer matrix, types of bombarded ions and implantation regimes.

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