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MA: Fachverband Magnetismus
MA 37: Magnetic Imaging Techniques
MA 37.2: Vortrag
Donnerstag, 20. März 2025, 15:15–15:30, H16
Nanoscale magnetic imaging with color centers in fiber-coupled diamond nanobeams — •Gesa Welker1, Yufan Li1, Richard Norte2, and Toeno van der Sar1 — 1Delft University of Technology, Faculty of Applied Sciences, Lorentzweg 1, 2628 CJ Delft, the Netherlands — 2Delft University of Technology, Faculty of Mechanical Engineering, Mekelweg 2, 2628 CD Delft, the Netherlands
Nitrogen vacancy centers (NV-centers) in diamond are powerful magnetic field sensors that are excited and read out optically. They are an established tool for imaging weak magnetic signatures of condensed matter samples such as skyrmions, spin waves or 2D magnetism [1]. We present a unique fiber-coupled approach to scanning probe magnetometry, where a diamond nanobeam with NV-centers at its apex is attached to a tapered optical fiber and scanned across a sample [2]. Fiber-coupling could enable a higher excitation and collection efficiency compared to traditional setups. It also simplifies measurements at low temperatures, because it eliminates the need for re-alignment of free-space optics. We demonstrate diamond nanobeam fabrication via quasi-isotropic etching and a robust nanobeam-fiber assembly using optical glue. With this setup, we performed a 2D scan of the magnetic stray field of a current-carrying wire with sub-micrometer resolution [3]. Our method is also promising for magnetic sensing with recently emerged color centers such as tin vacancy centers (SnV-centers) [4].
[1] Casola et al. Nat. Rev. Mater 3, 17088 (2018) [2] Y. Li et al. ACS Photonics 10, 1859-1865 (2023) [3] Y. Li, G. Welker et al., New J. Phys. 26, 103031 (2024) [4] T. Iwasaki et al. PRL 119, 253601 (2017)
Keywords: NV-centers in diamond; SnV-centers in diamond; magnetometry; magnetic sensing