Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.28: Poster
Dienstag, 6. September 2022, 17:30–20:00, P2
Imaging the coherent spin dynamics of nitrogen vacancies coupled to CrTe2 at room temperature — •Riccardo Silvioli1, Martin Schalk1, Karina Houska1, Dominik Bucher2, Zdenek Sofer3, Andreas V. Stier1, and Jonathan J. Finley1 — 1WSI, TUM — 2Chemie, TUM — 3UCT Prague
Magnetic resonance imaging of coupled spin-systems is a technique capable of rendering highly accurate descriptions of magnetic fields even at room temperature, and is therefore lying at the heart of various applications in medicine, chemistry and physics. We present coherent wide-field imaging of a 100 x 100 µ m sized region of interest implanted with nitrogen vacancy centers (NVs) in diamond coupled to a 50 nm thick flake of the in-plane van der Waals ferromagnet CrTe2. We can quantitatively probe the stray magnetic field of the material with the NVs’ electron spin signal. First, we combine the nano-scale sample shapes measured by atomic force microscope with the magnetic resonance imaging data for accurate reconstruction of the sample’s magnetization. We then map out the coherent dynamics of the colour centers coupled to the van der Waals ferromagnet using pixel-wise coherent Rabi and Ramsey imaging of the NV sensor layer. We find that the spin coherence of the ensemble is strictly correlated with the variation in the magnetic field generated by the sample. What results is an enhanced detection of the magnetic field where we describe its variation in three dimensions, improving the reconstruction of the magnetization. Finally, we infer the quantum dynamics using a neural network to speed up the convergence of the pixel-wise Hamiltonian fitting.