Abstract
A scanning force microscope capable of operating at temperatures down to 15 mK has been designed and built for studies of disorder in mesoscopic transport. The compact microscope fits into the mixing chamber of a dilution refrigerator/high field magnet system. Coarse approach of the tip to the sample is achieved with a specially designed piezoelectrically driven linear motor which can reliably step the tip as little as 10 nm both with and against gravity. Deflection of the Si3N4 cantilever is detected with an optical fiber interferometer. A standard piezo-tube scans the tip over a 2 μm range, while a separate sample translation stage allows the location of small samples over a 4 mm2 area. The vertical resolution of the microscope at 4.2 K is of order 1 A.
Published Version
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