Capacitive Cantilever Magnetometer User Instrumentation
Silicon Beam Cantilever
The cantilever beam magnetometer is available to measure the force and torque on a magnetic moment in a magnetic field. In a typical setup it can resolve 10-4 N/uV. This is roughly equivalent to a resolutions of 10-7 emu (10-10 J/T) in a field gradient of 0.1 T/cm. The torque mode is more sensitive, resolving 10-9 emu of torque at 20 T. Sample sizes are limited to 1 mm3 with a maximum weight of 10 mg. The cantilever measurement system can operate between 30 mK and 0.5 K in fields up to 18 T, and between 0.5 K and 300 K in fields up to 45 T.
A more robust cantilever has been manufactured for applications which do not require the limits of sensitivity. These cantilevers are constructed from 5-micron thick metal film. (The film is slightly ferromagnetic with a saturation field below 0.5 tesla, so all data will have a linear background term that must be subtracted during analysis.) The metal film cantilevers have been used to measure M vs. H curves for ferromagnetic films and for a variety of superconducting wire.
Download Documentation
For more information about the magnetometry facilities, contact Eun Sang Choi. For information about scheduling magnet time and submitting facility requests, contact Interim DC Program Director Tim Murphy.
