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.
Bibliographical noteFunding Information:
This work is supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT) ( NRF-2021R1F1A1049355 ) and ( NRF-2019M3E4A1080232 ), and the MSIT(Ministry of Science and ICT), Korea , under the ITRC(Information Technology Research Center) support program ( IITP-2021-2020-0-01606 ) supervised by the IITP(Institute of Information & Communications Technology Planning & Evaluation). T. Choi and A. Heinrich acknowledge the support from the Institute for Basic Science ( IBS-R027-D1 ).
© 2021 Korean Physical Society
- Diamond NV center
- Imaging current flow
- Scanning magnetometer