Journal article

Apparent delocalization of the current density in metallic wires observed with diamond nitrogen-vacancy magnetometry

J-P Tetienne, N Dontschuk, DA Broadway, SE Lillie, T Teraji, DA Simpson, A Stacey, LCL Hollenberg



We report on a quantitative analysis of the magnetic field generated by a continuous current running in metallic microwires fabricated on an electrically insulating diamond substrate. A layer of nitrogen-vacancy (NV) centers engineered near the diamond surface is employed to obtain spatial maps of the vector magnetic field, by measuring Zeeman shifts through optically detected magnetic resonance spectroscopy. The in-plane magnetic field (i.e., parallel to the diamond surface) is found to be significantly weaker than predicted, while the out-of-plane field also exhibits an unexpected modulation. We show that the measured magnetic field is incompatible with Ampère's circuital law or Gauss's la..

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Awarded by Australian Research Council (ARC)

Awarded by CREST of JST, Japan

Funding Acknowledgements

We acknowledge interesting discussions with M. Doherty, M. Usman, A. Wood, S. Rachel, B. Johnson, J. McCallum, R. Scholten, A. Martin, M. Barson, J. McCoey, L. Hall, and D. McCloskey. This work was supported by the Australian Research Council (ARC) through Grants No. DE170100129, No. CE170100012, and No. FL130100119. D.A.B. and S.E.L. are supported by an Australian Government Research Training Program Scholarship. T.T. acknowledges the support of Grants-in-Aid for Scientific Research (Grants No. 15H03980, No. 26220903, and No. 16H06326), the "Nanotechnology Platform Project" of MEXT, Japan, and CREST (Grant No. JPMJCR1773) of JST, Japan.