Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetism Poster B

MA 51.7: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster C

VSM4VTI - thin film measurements with DIY-magnetometer — •Alfons Georg Schuck, Jörg Franke, and Michael Huth — Institute of Physics, Goethe University, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany

A Vibrating Sample Magnetometer (VSM), which is designed as a top loading probe for a variable-temperature insert (VTI) is described. It is constructed as an affordable "do-it-yourself" alternative to commercial Physical Properties Measurement Systems (PPMS) with small samples like thin films in mind. The magnetometer uses a voice-coil drive in a resonator-setup. The sample oscillation is monitored by a quadrature encoder. The correct positioning of the sample in the center of a gradiometer coil is ensured by a stepper-motor driven linear actuator. Details of the VSM design are presented.

In combination with a common lock-in-amplifier, the device is highly sensitive. Measurements of a thin film at low temperatures are performed as well as complemental numerical simulations. Influences of the sample holder and the substrate on the measurements are described.