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TT: Fachverband Tiefe Temperaturen

TT 10: Poster Session: Superconductivity

TT 10.5: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Low-temperature MFM based on piezoresistive cantilevers — Philip Meiser, •Michael R Koblischka, and Uwe Hartmann — Institute of Experimental Physics, Saarland University, P.O.Box 151150, D-66041 Saarbrücken, Germany

We present the construction of a low-temperature magnetic force microscope (MFM) operating at temperatures down to 1.5 K and in fields up to 5 T. The MFM is based on commercial piezoresistive cantilevers, coated with 30 nm-thick layers of CoCr. In this contribution, we show details of the construction of the home-built MFM head and discuss the dependence of the piezoresistive signal, the resonance frequency, the obtained resonance curves and the quality facors on temperature. Furthermore, we present measurements on magnetite thin films and superconducting ring structures based on Pb thin films.