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Abstract:
We present a design for a magnetometer capable of operating at
temperatures down to 50 mK and magnetic fields up to 15 T with
integrated sample temperature measurement. Our design is based on the
concept of a Faraday force magnetometer with a load-sensing variable
capacitor. A plastic body allows for fast sweep rates and sample
temperature measurement, and the possibility of regulating the initial
capacitance simplifies the initial bridge balancing. Under moderate
gradient fields of similar to 1 T/m our prototype performed with a
resolution better than 1 x 10(-5) emu. The magnetometer can be operated
either in a dc mode, or in an oscillatory mode which allows the
determination of the magnetic susceptibility. We present measurements on
Dy2Ti2O7 and Sr3Ru2O7 as an example of its performance. (C) 2012
American Institute of Physics. [http://dx.doi.org/10.1063/1.4769049]
