Surface diffusion assisted phase separation during the growth of carbon:transition metal nanocomposite thin films

Surface diffusion assisted phase separation during the growth of carbon:transition metal nanocomposite thin films

Abrasonis, G.

Encapsulated nanostructures formed by surface diffusion assisted phase separation during thin film growth are promising candidates for the multifunctional devices, high density magnetic storage media, multifunctional coatings, as large scale templates for nanowire fabrication. In this talk our activities concerning the investigation of the growth mechanisms of carbon: transition metal (TM=V,Co,Ni,Cu) thin films grown in the in the substrate temperature range of RT- RT-500 C will be summarized [1-5]. Vanadium (copper) is in the carbidic(metallic) state in the whole temperature range while Co and Ni undergo a transition from a carbidic towards a metallic state [3]. The vanadium carbide nanoparticles exhibit a globular shape independently on the growth temperature, while the other metals show a transition from a globular towards a columnar growth when the substrate temperature increases. At a fixed temperature, the morphology of Ni nanocolumns significantly depends on the substrate type which points out that the initial stages of the film growth determine the structure of the subsequently grown film [5]. The use of the hyperthermal species introduces an additional complexity in the phase separation process and allows obtaining a significantly larger variety of nanostructures due to the intperlay of vertical and lateral phase separation processes (disordered array of nanoparticles, self-organized multilayers, nanocolumns or liquid-like coalescence) [4].

[1] G. Abrasonis, M .Krause, A. Mucklich, K. Sedlackova, G. Radnoczi, U. Kreissig, A. Kolitsch, W. Moller, “Growth regimes and metal enhanced 6-fold ring clustering of carbon in carbon-nickel composite thin films”, Carbon 45, 2995 (2007).

[2] G. Abrasonis, A.C. Scheinost , S. Zhou, R. Torres, R. Gago, I. Jimenez, K. Kuepper, K. Potzger, M. Krause, A. Kolitsch, W. Moeller, S. Bartkowski, M. Neumann, R. R. Gareev, “X-ray spectroscopic and magnetic investigation of C : Ni nanocomposite films grown by ion beam cosputtering”, J. Phys. Chem. C 112, 12628 (2008).

[3] G. Abrasonis, M. Berndt, M. Krause, K. Kuepper, F. Munnik, A. Kolitsch, W. Moller, “Soft X-ray Absorption and Emission Spectroscopic Investigation of Carbon and Carbon: Transition Metal Composite Films”, J. Phys. Chem. C 112, 17161 (2008).

[4] G. Abrasonis, G. Kovacs, L. Ryves, M. Krause, A. Mucklich, F. Munnik, M. Bilek, W. Moller, “Phase separation in carbon-nickel films during hyperthermal ion deposition“, J. Appl. Phys. submitted.

[5] G. Abrasonis, A. Mucklich, G. Kovacs, D. Babonneau, A. Martinavicius, M. Berndt, F. Munnik, M. Vinnichenko, K. H. Heinig, J. Grenzer, A. Kolitsch, W. Moller, ”Substrate Effect on the Surface Diffusion Assisted Phase Separation during the Growth of C:Ni Nanocomposite Films”, J. Phys. Chem. C submitted.

  • Invited lecture (Conferences)
    Second Plasma-Nano International workshop at CSIRO, Lindfield, Australia, 09.02.2009, Lindfield, Australia

Publ.-Id: 12699