Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.38: Poster

Montag, 26. März 2012, 15:00–19:00, Poster B

Microcantilevers for Torque Magnetometry — •Stefanos Chalkidis, Stephan Albert, Benedikt Rupprecht, Marc Wilde, and Dirk Grundler — James-Franck-Straße 1, 85747 Garching, Deutschland

Torque magnetometry has proven to be powerful to measure magnetic oscillations of two-dimensional electron systems (2DES) at low temperature. For conventional 2DES in, e.g., semiconductor heterostructures, corresponding cantilevers supported 2DES of 1 mm2. Graphene, the first truly 2D crystal, is an intriguing candidate for examination by torque magnetometry. Our calculations show that magnetic oscillations in exfoliated high-mobility graphene are roughly four orders of magnitude smaller than for the conventional 2DES due to small sample size. This necessitates the development of miniaturized cantilevers. We report our calculation and the progress in the preparation of such cantilevers by reactive-ion-etching from the device layer of a silicon-on-insulator wafer. We will discuss different sensor designs that we analyze either analytically or by finite element simulations. Financial support by the DFG via project no. WI3320/1-1 in the priority programme "Graphene" is gratefully acknowledged as well as experimental support by the Nanosystems Initiative Munich.