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Conducting ion tracks generated by charge-selected swift heavy ions

Gupta, Srashti and Gehrke, H.G. and Krauser, J. and Trautmann, C. and Severin, D. and Bender, M. and Rothard, H. and Hofsäss, H. (2016):
Conducting ion tracks generated by charge-selected swift heavy ions.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier Science Publishing, pp. 76-83, 381, ISSN 0168583X,
[Online-Edition: http://dx.doi.org/10.1016/j.nimb.2016.05.010],
[Article]

Abstract

Conducting ion tracks in tetrahedral amorphous carbon (ta-C) thin films were generated by irradiation with swift heavy ions of well-defined charge state. The conductivity of tracks and the surface topography of the films, showing characteristic hillocks at each track position, were investigated using conductive atomic force microscopy measurements. The dependence of track conductivity and hillock size on the charge state of the ions was studied using 4.6 MeV/u Pb ions of charge state 53+, 56+ and 60+ provided by GANIL, as well as 4.8 MeV/u Bi and Au ions of charge state from 50+ to 61+ and 4.2 MeV/u 238U ions in equilibrium charge state provided by UNILAC of GSI. For the charge state selection at GSI, an additional stripper-foil system was installed at the M-branch that now allows routine irradiations with ions of selected charge states. The conductivity of tracks in ta-C increases significantly when the charge state increases from 51+ to 60+. However, the conductivity of individual tracks on the same sample still shows large variations, indicating that tracks formed in ta-C are either inhomogeneous or the conductivity is limited by the interface between ion track and Si substrate.

Item Type: Article
Erschienen: 2016
Creators: Gupta, Srashti and Gehrke, H.G. and Krauser, J. and Trautmann, C. and Severin, D. and Bender, M. and Rothard, H. and Hofsäss, H.
Title: Conducting ion tracks generated by charge-selected swift heavy ions
Language: English
Abstract:

Conducting ion tracks in tetrahedral amorphous carbon (ta-C) thin films were generated by irradiation with swift heavy ions of well-defined charge state. The conductivity of tracks and the surface topography of the films, showing characteristic hillocks at each track position, were investigated using conductive atomic force microscopy measurements. The dependence of track conductivity and hillock size on the charge state of the ions was studied using 4.6 MeV/u Pb ions of charge state 53+, 56+ and 60+ provided by GANIL, as well as 4.8 MeV/u Bi and Au ions of charge state from 50+ to 61+ and 4.2 MeV/u 238U ions in equilibrium charge state provided by UNILAC of GSI. For the charge state selection at GSI, an additional stripper-foil system was installed at the M-branch that now allows routine irradiations with ions of selected charge states. The conductivity of tracks in ta-C increases significantly when the charge state increases from 51+ to 60+. However, the conductivity of individual tracks on the same sample still shows large variations, indicating that tracks formed in ta-C are either inhomogeneous or the conductivity is limited by the interface between ion track and Si substrate.

Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 381
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Ion tracks, Diamond like carbon, Swift heavy ions
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 15 Jun 2016 07:52
Official URL: http://dx.doi.org/10.1016/j.nimb.2016.05.010
Identification Number: doi:10.1016/j.nimb.2016.05.010
Funders: This work was funded by BMBF under the program ‘condensed matter research at large scale facilities’.
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