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MA: Fachverband Magnetismus

MA 36: Magnetic Measurement Techniques

MA 36.2: Talk

Thursday, March 14, 2013, 10:00–10:15, H3

Characterization of graphene micro Hall-Probe magnetometers — •Philipp Weber, Wolfgang Kroener, Michael Enzelberger, Klaus Gieb, and Paul Müller — Lehrstuhl für Experimentalphysik, Universität Erlangen, Germany

Due to its low charge carrier concentration and low dimensionality graphene is a promising candidate for high-sensitive Hall probes. We have produced Hall bar structures from commercially available CVD-graphene by means of electron beam lithography and oxygen plasma etching. Charge carrier concentration and mobility confirm the high quality of these devices. We were able to produce Hall probes with properties comparable to standard 2DEG GaAs Hall probes. Angular resolved magnetotransport measurements at magnetic fields up to 14 T and temperatures down to 300 mK are presented. We discuss in detail various parameters influencing the basic sensitivity for measuring magnetic moments. As a proof of concept we have performed magnetization measurements of several reference materials.