Structural and magnetic properties of iron and cobalt implanted silicone polymers

40 keV Fe+ and Co+ ions were implanted in both viscous and solid silicone s ubstrates at doses of (0.1-1.8) x 10(17) ions/cm(2) and an ion current dens ity of 4 mu A/cm(2). The microstructure and magnetic properties of the Fe- and Co-implanted silicons layers were then investigated as a function of th e initial relaxation state (viscosity) of the polymer target. TEM investiga tions showed that granular Fe and Co films consisting of fine isolated part icles are synthesized in the solid substrates at doses higher than 0.3 x 10 (17) ions/cm(2). At the same dose multiparticle iron agglomerates and close ly packed large Co particles with a mean size of 200 nm are formed in subst rates implanted in the viscous state. FRAP studies revealed essential diffe rences in the magnetic properties of the metal films synthesized at differe nt viscosity of the silicone substrate. The temperature dependence of the F MR spectra and the dose dependence of the effective magnetization of the sy nthesized films were studied. (C) 2000 Elsevier Science B.V. All rights res erved.