Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 16: Magnetic characterization techniques

MA 16.5: Talk

Tuesday, March 13, 2018, 10:30–10:45, H 0112

Gold and Graphene Hall Sensors for Scanning Magnetic Field Measurements on Magnetic Microstructures — •Manuela Gerken, André Müller, Davood Momeni Pakdehi, Thomas Weimann, Sibylle Sievers, and Hans Werner Schumacher — Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig

Within the overall miniaturization, also magnetic devices are being scaled down into the micro- and nanometer range. This leads to an increasing demand for high resolution quantitative metrology for the resulting spatially varying device stray fields. One promising approach is scanning magnetic field microscopy with Hall sensors. Here, we will present our results on the development of gold and graphene Hall sensors with active areas down to 50 nm x 50 nm. There are some hints that these materials are superior to semiconductor sensors for small active areas and at room temperature (RT). For example, gold sensors are supposed to have a better signal to noise ratio due to the higher applicable current. In contrast, graphene can reveal low carrier density and thus a high RT Hall coefficient. We will address fabrication and design issues of both types of nano-Hall sensors. Furthermore we will discuss the results of the sensor characterization including sensor sensitivity, stability and noise figures as well as an estimation of the uncertainty budget for quantitative magnetic field measurements.