Magnetic imaging of a single ferromagnetic nanowire using diamond atomic sensors. (26th July 2018)

• Record Type: Journal Article
• Authors: Lee, Myeongwon; Jang, Bumjin; Yoon, Jungbae; Mathpal, Mohan C; Lee, Yuhan; Kim, Chulki; Pane, Salvador; Nelson, Bradley J; Lee, Donghun
• Is Part Of: Nanotechnology. Volume 29:Number 40(2018)
• Publication Date: 2018-07-26
• Subjects: magnetic field sensing and imaging -- diamond NV center -- ferromagnetic nanowire; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/aad2fe
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: 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.