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Negative magnetoresistance in Cr-containing diamond-like carbon-based heterostructures

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Abstract

We have characterized the local structure around the Cr atom, as a function of Cr content, in films of chromium-doped hydrogenated amorphous diamond-like carbon (Cr-DLC) synthesized by plasma-enhanced chemical vapor deposition (PECVD). The composition appears to be related to the structure and forward bias magnetoresistance in heterojunction devices. Chromium in diamond-like carbon (DLC) has a chemical state much like chromium carbide and, at low Cr content, the Cr is dissolved in an amorphous DLC matrix forming an atomic-scale composite. At higher Cr content, Cr is present as nano-composite and chromium carbide precipitates preferentially form at the surface of the film. In these films of higher chromium concentration, a large coefficient of negative magnetoresistance is observed in heterojunction devices with n-type silicon.

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Authors and Affiliations

  1. Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska—Lincoln, P.O. Box 880111, Lincoln, NE, 68588-0111, USA

    Juan A. Colón Santana, A. Sokolov & Ihor Ketsman

  2. Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, LA, 70806, USA

    V. Singh, V. Palshin & Y. B. Losovyj

  3. Department of Physics, South Dakota School of Mines and Technology, Rapid City, SD, 57701, USA

    E. M. Handberg & A. G. Petukhov

Authors
  1. Juan A. Colón Santana
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  2. V. Singh
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  3. V. Palshin
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  4. E. M. Handberg
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  5. A. G. Petukhov
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  6. Y. B. Losovyj
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  7. A. Sokolov
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  8. Ihor Ketsman
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Correspondence to Ihor Ketsman.

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Colón Santana, J.A., Singh, V., Palshin, V. et al. Negative magnetoresistance in Cr-containing diamond-like carbon-based heterostructures. Appl. Phys. A 98, 811–819 (2010). https://doi.org/10.1007/s00339-009-5529-z

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  • DOI: https://doi.org/10.1007/s00339-009-5529-z

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