Magnetic properties of iron-and cobalt-implanted silicone polymers

Composite metal-polymer thin films were formed by implantation of 40 KeV Fe + and Co+ ions into viscous and solid silicone substrates in the dose range of (0.3-1.5) x 10(17) ions/cm(2). Morphology and magnetic properties of th e synthesized films were investigated. TEM investigations showed that the m icrostructure of metal granular layers synthesized in silicone polymers str ongly depends on an initial relaxation state of the target. Magnetic resona nce studies revealed essential differences in the magnetic properties of th in metal films synthesized at different initial states of silicone substrat e and with respect to the type of implanted ions (Fe or Co). A shift and br oadening of FMR signal with the samples cooling are observed both for perpe ndicular and parallel orientation of the films with respect to the magnetic field. These effects are associated with the increase of the inter-particl e interactions and superparamagnetism blocking in the particles. It was fou nd that the viscous initial, state of the polymer is a favourable factor fo r the high anisotropy of FMR response in Fe-implanted samples in contrast t o the Go-based ones. The reasons for this have been discussed with respect to the morphology of Fe and Co synthesized films. (C) 2000 Elsevier Science Ltd. All rights reserved.