Lee, Myeongwon Jang, Bumjin Yoon, Jungbae Mathpal, Mohan C. Lee, Yuhan Kim, Chulki Pane, Salvador Nelson, Bradley J. Lee, Donghun 2024-01-19T21:33:11Z 2024-01-19T21:33:11Z 2021-09-04 2018-10-05 0957-4484 https://pubs.kist.re.kr/handle/201004/120804 Recent advances in nanorobotic manipulation of ferromagnetic nanowires bring new avenues for applications in the biomedical area, such as targeted drug delivery, diagnostics or localized surgery. However, probing a single nanowire and monitoring its dynamics remains a challenge since it demands high precision sensing, high-resolution imaging, and stable operations in fluidic environments. Here, we report on a novel method of imaging and sensing magnetic fields from a single ferromagnetic nanowire with an atomic-scale sensor in diamond, i.e. diamond nitrogen-vacancy (NV) defect center. The distribution of static magnetic fields around a single Co nanowire is mapped out by spatially distributed NV centers and the obtained image is further compared with numerical simulation for quantitative analysis. DC field measurements such as continuous-wave ODMR and Ramsey sequence are used in the paper and sub Gauss level of field sensing is demonstrated. By imaging magnetic fields at a single nanowire level, this work represents an important step toward tracking and probing of ferromagnetic nanowires in biomedical applications. English IOP PUBLISHING LTD Magnetic imaging of a single ferromagnetic nanowire using diamond atomic sensors Article 10.1088/1361-6528/aad2fe 1 NANOTECHNOLOGY, v.29, no.40 NANOTECHNOLOGY 29 40 scie scopus 000440059300001 2-s2.0-85051432203 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Science & Technology - Other Topics Materials Science Physics Article magnetic field sensing and imaging diamond NV center ferromagnetic nanowire