SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 12: Quantum Technology
Q 12.2: Poster
Mittwoch, 22. September 2021, 16:30–18:30, P
Magnetometry on spin-crossover complexes using nitrogen-vacancy centers in nanodiamonds — •Isabel Manes1, Jonas Gutsche1, Tim Hochdörffer1, Gereon Niedner-Schatteburg2, and Artur Widera1 — 1Physics Department, Technische Universtät Kaiserslautern und Forschungszentrum OPTIMAS, 67663 Kaiserslautern — 2Chemistry Department, Technische Universtät Kaiserslautern, Erwin-Schrödinger-Str. 52 67663 Kaiserslautern
Using various measurement protocols, the nitrogen-vacancy (NV) center’s spin state can be optically initialized and read out. Magnetically, electrically and thermally sensitive, NV centers in nanodiamonds have been used as multipurpose nanoscale sensors.
Here, we present the application of NV centers as magnetic-field sensors to detect changes of magnetic fields caused by the spin transition of a chemical spin-crossover (SCO) complex. The examined polymeric Fe(II)-SCO complex is expected to switch from its diamagnetic low-spin state of S = 0 to a paramagnetic high-spin state of S = 2 per Fe(II) ion at ∼ 47 ∘C. This thermally-induced SCO would cause a change in a local magnetic field. Using a simple model, we estimate this change to be in the order of 1 mT. Experimentally, we deposit nanodiamonds of approximately 700 nm average size and with less than 1 ppm NV centers on a thin-layer sample of the SCO complex. We perform temperature-dependent CW optically detected magnetic resonance spectroscopy using a self-built temperature-controlled sample holder. With temperatures rising above 47 ∘C, resonance frequencies are expected to shift in the MHz range.