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MA: Fachverband Magnetismus
MA 19: Characterization and Instrumentation
MA 19.3: Vortrag
Montag, 16. März 2020, 17:45–18:00, HSZ 101
Optical magnetometer based on NV centers in diamond for calibration of superconducting vector magnets — •Severine Diziain1, Nicole Raatz2, Sebastien Pezzagna2, Robert Staacke2, Roger John2, Lukas Botsch1, Bernd Abel3, Jan Meijer2, and Pablo Esquinazi1 — 1Universität Leipzig, Felix-Bloch-Institut für Festkörperphysik, SUM, Leipzig, Germany — 2Universität Leipzig, Felix-Bloch-Institut für Festkörperphysik, AQS, Leipzig, Germany — 3Leibniz-Institut für Oberflächenmodifizierung e. V., Leipzig, Germany
Due to their ability to generate highly stable fields, superconducting vector magnets are commonly used for the characterization of magnetic properties of materials developed for spintronic applications. Because of flux trapping, the magnitude of the generated magnetic fields depends on the previous magnetization of the magnet and can not be determined by the applied current but must be measured. Usually vectorial magnetic field measurements are performed with three Hall sensors that have to be calibrated at all temperatures since their Hall voltage and offset are temperature dependent. This calibration can not be easily done inside a magnet that has been already energized because of remanent fields. Here we present an alternative that consists in measuring vectorial magnetic fields with a single optical magnetometer based on NV centers in diamond. These magnetometers allow for an easy reset of the vector magnet and therefore can be calibrated in-situ. Additionally since a single detector is enough to measure a vectorial field instead of three Hall sensors a better accuracy is obtained.