Thermomagnetic force at low pressures

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Abstract
The longitudinal component of the thermomagnetic force on a disk with surface perpendicular to the heat flux between parallel plates has been measured in N2 and HD at pressures near the observed maximum in the thermal and thermomagnetic forces. A comprehensive study of the thermomagnetic force in N2 was conducted as a function of pressure, magnetic field strength, disk size, disk thermal conductivity, and applied thermal gradient. The data on N2 and HD are in agreement with a recent theory derived for the Waldmann limit. In addition, a preliminary measurement of the thermomagnetic force on a sphere is reported.