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arXiv · 1702.05409

Fabrication and electrical transport properties of embedded graphite microwires in a diamond matrix

J. Barzola-Quiquia·T. Lühmann·R. Wunderlich·M. Stiller·M. Zoraghi·J. Meijer·P. Esquinazi·J. Böttner·I. Estrela-Lopis
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Abstract

Micrometer width and nanometer thick wires with different shapes were produced $\approx 3~\upmu$m below the surface of a diamond crystal using a microbeam of He$^+$ ions with 1.8~MeV energy. Initial samples are amorphous and after annealing at $T\approx 1475$~K, the wires crystallized into a graphite-like structures, according to confocal Raman spectroscopy measurements. The electrical resistivity at room temperature is only one order of magnitude larger than the in-plane resistivity of highly oriented pyrolytic bulk graphite and shows a small resistivity ratio($\rho(2{\rm K})/\rho(315{\rm K}) \approx 1.275$). A small negative magnetoresistance below $T=200$~K was measured and can be well understood taking spin-dependent scattering processes into account. The used method provides the means to design and produce millimeter to micrometer sized conducting circuits with arbitrary shape embedded in a diamond matrix.

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J. Barzola-Quiquia, T. Lühmann, R. Wunderlich, M. Stiller, M. Zoraghi, J. Meijer, P. Esquinazi, J. Böttner, I. Estrela-Lopis. 2017-02-13. Fabrication and electrical transport properties of embedded graphite microwires in a diamond matrix. https://doi.org/10.1088/1361-6463/aa6013

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