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DS: Dünne Schichten
DS 1: Ionenimplantation I
DS 1.7: Vortrag
Montag, 8. März 2004, 11:00–11:15, HS 31
Interface modification of non-miscible multilayer systems by swift heavy ions — •W. Bolse1, C. Rumbolz1, B. Schattat1, D. Kabiraj2, D.K. Avasthi2, and R.S. Chauhan3 — 1Institut für Strahlenphysik, Universität Stuttgart, Germany — 2Nuclear Science Centre, New Delhi, India — 3R.B.S. College, Agra, India
Thin film packages of thermally miscible materials can, as a rule, also be intermixed by means of swift heavy ion irradiation, as was shown for a number of ceramic, semiconducting and also metallic systems. In the present study we have investigated the response of thermally non-miscible Fe-Ag- and Fe-Au multilayers on the low temperature irradiation with swift heavy ions, ranging from 90 MeV Ar- to 350 MeV Au-ions. In addition, the (non-irradiated) Fe-Au multilayers were also heated in Ar-atmosphere to test the thermally induced behaviour. The elemental distribution in the films before and after irradiation or heating, respectively, was determined by means of Rutherford Backscattering Spectrometry (RBS). While the Fe-Ag didn’t show any effect, the RBS-spectra of the Fe-Au samples indicated a reduction of the interface roughness upon irradiation (except for Ar ions). According to RBS simulations the Au-layer transforms from a rough structure of half-sphere like islands into a smooth layer. Heating of the multilayers on the other hand resulted in broadening of the RBS-spectra, which we interprete as due to the formation of Au-spheres. The results will be discussed in terms of the reduction of the interface energy by ion beam and heat induced structural rearrangements.