Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster Magnetism III
MA 52.39: Poster
Donnerstag, 12. März 2026, 15:00–17:00, P4
Quantitative Distance Calibration and Magnetic Noise Imaging with Scanning NV Magnetometry — •Nikhita Khera1, Ephraim Spindler1, Aditya Kumar2, Robert Frömter2, Elke Neu Ruffing1, Mathias Weiler1, and Mathias Kläui2 — 1Department of Physics and Research Center Optimas, RPTU Kaiserslautern Landau — 2Institute of Physics, Johannes Gutenberg University Mainz
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. 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 domains, and want to see how relaxation times of NVs vary as compared to hematite. and 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