Dresden 2026 – scientific programme

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MA: Fachverband Magnetismus

MA 52: Poster Magnetism III

MA 52.39: Poster

Thursday, March 12, 2026, 15:00–17:00, P4

Quantitative Distance Calibration and Magnetic Noise Imaging with Scanning NV Magnetometry — •Nikhita Khera, Ephraim Spindler, Kristin Kuehl, and Elke Neu Ruffing — RPTU in Kaiserslautern, Rheinland Pfalz, Germany

Nitrogen-vacancy (NV) enters in diamond are widely used as quantum sensors for nanoscale magnetometry and the study of spin dynamics. As part of ongoing work using a Scanning NV Magnetometer, we report progress towards quantitatively calibrated scanning NV measurements and applications to low-magnetisation systems. A central part of this work is the calibration if the sensor sample distance for scanning NV tips, which is essential for reliable spatial resolution. Using perpendicular magnetic anisotropy (PMA) reference sample, we perform distance calibration and aim to determine the NV orientation in the tip. When combined with complementary approaches such as reverse AFM to determine the NV position within the tip, this enables access to the full three-dimensional localisation of the quantum sensor. Beyond calibration, we explore magnetic fluctuations in antiferromagnetic insulators by measuring the NV spin relaxation times T1, giving insight into their local magnetic noise and spin dynamics. We also use scanning NV magnetometers to map stray fields - from exfoliated 2D- hematite flakes revealing nanoscale field structures associated with antiferromagnetic domain structures, and from 3-D printed nickel microstructures. Altogether, this work pushes forward scanning NV magnetometry and showcases its use across a variety of magnetic materials.

Keywords: Nitrogen-Vacancy Centers; Scanning NV Magnetometry; Sensor Calibration; Magnetic Noise