Berlin 2024 – scientific programme

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MA: Fachverband Magnetismus

MA 47: Poster III

MA 47.12: Poster

Thursday, March 21, 2024, 15:00–18:00, Poster D

Detection of Nanoscale Magnetic Fields with Scanning NV Magnetometry — •Ricarda Reuter, Sibylle Sievers, and Hans Werner Schumacher — Physikalisch-Technische Bundesanstalt (PTB), Bundesallee 100, 38116 Braunschweig, Germany

The key component of Scanning nitrogen-vacancy (NV) measurements is the NV center, a point defect in a diamond host lattice. Due to its unique electronic structure, the NV center can be utilized to detect magnetic fields with sensitivities up to several nT/sqrt(Hz), which are read out optically. Scanning NV setups combine an optical excitation/detection path with an Atomic Force Microscope (AFM), ideally providing nanoscale magnetic and spatial resolution at the same time.

However, the actual magnetic resolution of Scanning NV depends on several factors, including the distance between NV center and sample surface, the shape of the nanodiamond tip, and the measurement time. Quantities like the coherence time and optically detected magnetic resonance (ODMR) contrast of the NV center have to be considered as well.

We discuss the impact of these factors on measurements of typical nanoscale magnetic structures with different characteristic dimensions and compare our results to vacuum Magnetic Force Microscope (MFM) measurements. Due to the versatility of our approach, the sensitivity of other magnetic field sensors such as Hall or SQUID sensors can be calculated in a similar way by considering the respective sensor's parameters. This way, assessing the magnetic resolution and comparing different measurement techniques will be simplified significantly.

Keywords: Nitrogen vacancy; Scanning NV; Magnetometry; Magnetic resolution; Magnetic field sensitivity