Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Poster 1
HL 13.23: Poster
Monday, March 26, 2007, 15:00–17:30, Poster A
Design and realization of micromechanical cantilevers for magnetization studies of two-dimensional electron systems in nanostructures — •T. Windisch1, O. Roesler1, J. I. Springborn1, N. Ruhe1, Ch. Heyn1, D. Heitmann1, M. A. Wilde2, and D. Grundler2 — 1Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg — 2Physik Department E10, Technische Universität München, James-Franck-Straße 1, D-85748 Garching
We have designed and realized micromechanical cantilever magnetometers (MCMs) which allows us to measure the magnetization M of small arrays of nanostructures incorporating a low-dimensional electron system. According to M=−(∂ U/∂ B)N,T (B is the magnetic field) at low temperature T provides direct information about the magnetic field dependence of the ground state energy U. To get a high signal-to-noise ratio for a small electron number N we first optimized the shape, thickness and width of our MCMs using finite-element simulations (FEM). To test the developed sensor layout we secondly fabricated MCMs from a specifically designed GaAs heterostructure by electron beam lithography and etching of sacrificial layers. The lateral size was about 40 µ m × 120 µm. Using interferometric fiber optics we readout the MCMs at T=300 mK and measured the de Haas-van Alphen effect of an integrated two-dimensional electron system. We report the FEM optimization study and our experimental results. We thank the Deutsche Forschungsgemeinschaft for financial support via SFB 508 and the excellence cluster Nanosystems Initiative Munich.