Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 25: Magnetic Imaging and Sensors II
MA 25.2: Vortrag
Mittwoch, 20. März 2024, 09:45–10:00, EB 301
Development of an Ultra High Vacuum and Low Temperature Scanning NV Magnetometer — •Sandip Maity1, Dinesh Pinto1,2, Ricardo Javier peña Román1, Klaus Kern1,2, and Aparajita Singha1 — 1Max Planck Institute for Solid State Research, Stuttgart, Germany — 2Institut de Physique, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
The nanoscale spatial resolution and ambient condition measurement capabilities of nitrogen vacancy (NV) sensors have enabled us to perform magnetic imaging through scanning probe microscopy (SPM) across a wide range of temperature and pressure. I will be discussing the development of a scanning probe magnetometer, capable of imaging magnetic nanostructures with a high spatial resolution under ultrahigh vacuum and low temperature (10−10 mbar and 4 K) conditions, enabled with an external vector magnetic field (1 T in z and 0.25 T in both x and y direction). Here, NV centers are integrated within diamond tips to perform Atomic Force Microscopy (AFM). We have used NV tips with a home built tip holder equipped with an AFM amplifier and microwave excitations on the tip (not on the sample), allowing us to have a magnetic image of any region of a sample without restriction. Optically Detected Magnetic Resonance (ODMR) using Zeeman splitting can locally quantify the stray magnetic field from a sample. Additionally, the integrated facilities involving UHV and low temperature capabilities will allow us to investigate the stability of the NV probes and the effects of surface modifications at UHV condition, in a highly controlled manner.
Keywords: NV; AFM; Scanning Magnetometry; UHV and LT