Measuring Hall Conductivity Using a Cantilever Torque Magnetometer*

We present Hall conductivity measurements of Corbino-disk patterned thin film samples on a cantilever-based torque magnetometer. When a voltage is applied across the sample and a magnetic field is applied through the sample plane, the Hall current provides a magnetic moment that interacts with the external magnetic field and yields a torque on the end of the cantilever. The symmetry of this technique eliminates contributions from longitudinal resistance, making Hall conductivity measurements of previously inaccessible materials possible. Following a demonstration of how we determine the elastic properties of the cantilever system, we discuss various realizations of the technique, including for transverse thermoelectric currents, and show preliminary results on simple electronic systems.