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O: Fachverband Oberflächenphysik
O 30: Surface Magnetism
O 30.3: Vortrag
Dienstag, 18. März 2025, 11:00–11:15, H11
Spin-lattice relaxation of nitrogen-vacancy centers in nanodiamonds on conducting and non-conducting surfaces — •Izidor Benedičič1, Yuri Tanuma1, Bastien Anézo1,2, Žiga Gosar1,3, and Denis Arčon1,3 — 1Department of Condensed Matter Physics, Jožef Stefan Institute, Ljubljana, Slovenia — 2Institut des Matériaux de Nantes Jean Rouxel (IMN), Nantes University, Nantes, France — 3Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana, Slovenia
Nitrogen-vacancy (NV) centers in diamond are versatile probes for the detection of both static magnetic fields and magnetic fluctuations. While single-NV sensors are very capable, they suffer from high cost and experimental complexity. Nanodiamonds with embedded NV ensembles offer a promising low-cost alternative, however, their application in solid-state physics has been largely overlooked. Here, we investigate the use of nanodiamonds for measuring the electrical conductivity of substrates. We measured the temperature dependence of longitudinal relaxation time T1 of NV centres in nanodiamonds on glass and gold substrates. We find that T1 is determined both by phononic relaxation processes and the coupling to the magnetic moments at the surface. All samples show a stretched exponential relaxation, hinting at a significant distribution of relaxation processes. The theoretical models show the intrinsic distribution is too wide to reliably detect coupling to electronic states even of very good conductors. Our results hint at the limitations of nanodiamonds for measurements of transport properties in condensed matter systems.
Keywords: Nitrogen-vacancy center; Relaxometry; Surface magnetism; Nanodiamond