SKM 2023 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 6: Poster

KFM 6.38: Poster

Dienstag, 28. März 2023, 17:00–19:00, P3

Combined Confocal-AFM setup — •Sergei Trofimov, Klaus Lips, and Boris Naydenov — BerlinJoint EPR Laboratory and Department Spins in Energy Conversion and Quantum Information Science (ASPIN), Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany

Single nitrogen-vacancy (NV) centers in diamond can be utilized for magnetic field sensing with high spatial resolution and high sensitivity. It is even possible to detect spin ensembles or magnetic nanoparticles if they are placed in the vicinity of an NV center. However, precise positioning of such structures is challenging. To tackle this problem AFM cantilevers can be utilized. One can move nanoparticles with a cantilever or attach them to it in order to bring them close to an NV center.

To conduct these experiments a Confocal-AFM setup based on a Park Systems NX12 AFM was built. This setup allows to place a cantilever in the vicinity of an NV center in a diamond sample using a moving sample stage and obtain luminescence maps with laser scanning technique using a set of galvo-mirrors.

To test the setup a diamond plate with NV centers was used to visualize magnetic field lines of a ferromagnetic cantilever. It was shown that the technique can be also applied to image and separately address NV centers that are as close as 10 nm apart. The maximum measured magnetic field strength was 146 ± 2 G when an NV center was 180 ± 10 nm away from the cantilever. A magnetic field gradient at this distance was estimated to be 0.3 G/nm.