Imaging oersted field around current flowing wire based on a diamond scanning magnetometer |
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| Institution: | 1. Department of Physics, Korea University, Seoul, South Korea;2. Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea;3. Center for Quantum Nanoscience (QNS), Institute for Basic Science (IBS), Seoul, South Korea;4. Department of Physics, Ewha Womans University, Seoul, South Korea |
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| Abstract: | We demonstrate imaging current flow in a transport device by measuring the current-induced Oersted field. A diamond scanning magnetometer that hosts a single nitrogen-vacancy (NV) center at the tip apex is used to obtain the image. We fabricate a U-shape of Pt wire and study evolution of the Oersted field as the current continuously changes its direction along the wire. We find a good agreement between the obtained results and the simulated images based on the Biot-Savart law. In order to show the capability of imaging different field components, we perform the same experiment but with two different axes of the NV center. This work provides a novel imaging method of the current profile and can be applied to various transport experiments. |
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| Keywords: | Imaging current flow Scanning magnetometer Diamond NV center |
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