Diaphragm magnetometer for dc measurements in high magnetic fields

We describe the design and operation of a force magnetometer with high sensitivity which can be easily used between room and sub-kelvin temperatures. The device can accommodate a large range of sample masses (10–0.001 g) with a relative resolution of 10−5 emu. The maximum sample size is only restricted by the geometry of the cryogenic and magnetic environment. The design is particularly suited for high magnetic field measurements or where no gradient coil is available.