Papers by Author: Miklos Kis-Varga

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Authors: Dezső L. Beke, G.A. Langer, A. Csik, Z. Erdélyi, Miklos Kis-Varga, I.A. Szabó, Z. Papp
1403
Authors: Miklos Kis-Varga, G.A. Langer, A. Csik, Z. Erdélyi, Dezső L. Beke
Abstract: Epitaxial, coherent Mo/V multilayers were deposited by magnetron sputtering on (001) oriented MgO substrates at 873K (sample MoV-T), 923K (sample MoV-U) and 973K (sample MoV-V), respectively. In order to estimate the concentration profiles in our multilayers, a superlattice refinement modelling procedure has been used on high-angle XRD symmetric scans. The Mo/V interfaces were always sharper than V/Mo ones (in this notation the order of element reflects the sequence of deposition: e.g. the Mo/V interface was formed by the deposition of the V on the Mo surface). Furthermore the interface diffuseness was only slightly different at the lowest substrate temperature, but the difference increased with increasing temperature and an abrupt concentration jump could be observed at the Mo/V interface in the sample, sputtered at the 973 K. This indicates that during deposition the interfacial mixing by impact exchange events is important and thermally activated processes (surface diffusion and/or jumps driven by segregation) are less effective. With increasing substrate temperature the thickness of the V/Mo interfaces were unchanged while the Mo/V interface became shaper and sharper i.e. thermally activated jumps were more active during deposition of V atoms. Thus in forming Mo/V interfaces the segregation tendency of V to the Mo surface results in enhanced exchanges between V atoms (buried in the near surface layers of the Mo substrate) and surface Mo atoms, leading to more sharper interface with increasing temperature. On the other hand during the formation of the V/Mo interfaces the chemical thickness of the interface, provided again by impact exchanges, was practically unchanged.
27
Authors: Miklos Kis-Varga, Dezső L. Beke, Lajos Daróczi
841
Authors: M.C. Benoudia, Jean Marc Roussel, Stephane Labat, O. Thomas, Dezső L. Beke, G.A. Langer, Miklos Kis-Varga
Abstract: In order to investigate interdiffusion in Mo/V multilayers, we present a method that combines both kinetic mean-field simulations and calculations of x-ray scattered intensity with disorder effects. Considering preliminary experimental data obtained on Mo(4nm)/V(2nm) multilayers, we show that the angular shift of spectra observed after annealing, should take place for both Fickian and asymmetric interdiffusion modes. In contrast, clear signatures of the interdiffusion modes are found from the simulation of the peak intensities. These results offer interesting perspectives for a full analysis of the interdiffusion in these systems.
13
Authors: R. Juhász, S. Szabó, Lajos Daróczi, Miklos Kis-Varga, Dezső L. Beke
111
Authors: Miklos Kis-Varga, Dezső L. Beke, Sándor Mészáros, K. Vad, Gy. Kerekes, Lajos Daróczi
961
Authors: S. Szabó, I. Brovko, Miklos Kis-Varga, Dezső L. Beke, G. Posgay
195
Authors: Miklos Kis-Varga, Dezső L. Beke
465
Authors: Lajos Daróczi, M.T. Beck, Dezső L. Beke, Miklos Kis-Varga, L. Harasztosi, N. Takács
319
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