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MON: Monday Contributed Sessions

MON 8: Quantum Sensing and Decoherence: Contributed Session to Symposium I

MON 8.3: Talk

Monday, September 8, 2025, 14:45–15:00, ZHG009

Height Calibration of Nitrogen Vacancy Diamond Tips Using Current-Carrying Wires — Robin Abram, •Ricarda Reuter, Alexander Fernández Scarioni, Sibylle Sievers, and Hans Werner Schumacher — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany

Scanning Nitrogen Vacancy Microscopy (SNVM) is a measurement technique capable of resolving the spatial distribution of magnetic stray fields with nanometer and microtesla resolution, respectively. It combines optical field detection with a scanning probe-like approach, where the key component is a diamond scanning tip containing a single NV center. While magnetic field measurements are quantum-calibrated with respect to the position of the NV center, precise knowledge of the distance to the sample is required to also consider the height dependence. Unfortunately, the latter can currently only be estimated with an uncertainty of up to several nanometers, most commonly from a calibration based on the stray field detection of ferromagnetic microstructures. We propose an improved height calibration based on SNVM studies of the current-induced Oersted field in Pt wires by Lee et al.. The out of plane field component is extracted from the raw data taken along the NV spin axis, following the approach first established by Schendel et al. and later applied to SNVM by Dovzhenko et al., and fitted to a numerical model. Compared to the calibration with ferromagnets, this approach is highly adaptable in terms of both magnetic and spatial resolution, thus contributing to fully exploiting the potential of the NV center as a quantum-based magnetic field sensor.

Keywords: Nitrogen Vacancy Center / NV Center; Stray Field Detection; Height Calibration; Magnetic Field Decomposition; Scanning Nitrogen Vacancy Microscopy (SNVM)