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MA: Fachverband Magnetismus
MA 6: Magnetic Imaging Techniques I
MA 6.1: Talk
Monday, March 9, 2026, 09:30–09:45, POT/0361
Nanoscale Dipolar Fields in Artificial Spin Ice Probed by Scanning NV Magnetometry — •Ephraim Spindler1, Vinayak Shantaram Bhat2, Elke Neu1, Mathias Weiler1, and M. Benjamin Jungfleisch2 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU in Kaiserslautern, Germany — 2Department of Physics & Astronomy, University of Delaware, Newark, USA
Artificial spin ices (ASI) offer a versatile platform to study frustration and collective spin dynamics in engineered magnetic lattices. We employ scanning probe microscopy based on a single nitrogen-vacancy (NV) center in diamond - a non-invasive, nanoscale quantum sensing technique - to study two square-lattice ASI systems with varied inter-element coupling strengths.
We use NV fluorescence quenching for rapid state determination and continuous-wave optically detected magnetic resonance to quantitatively map magnetic stray fields and extract vectorial dipolar field information. We fit the experimentally determined field components to micromagnetic simulations to infer local magnetic configurations in an iterative procedure.
These micromagnetic modeling results demonstrate that our method successfully quantifies the deviation between the expected and detected dipolar coupling field strengths, which we describe using an effective saturation magnetization. We show that the subtle magnetization tilt induced by small external fields is detectable and quantifiable through its impact on the local dipolar stray fields in the ASI.
Keywords: Nitrogen Vacancy; Artificial Spin Ice; NV; ASI