  Patterned two-dimensional electron gas (2DEG) systems into micrometer Hall
bars can be used as Hall magnetosensors to provide detailed information on the
magnetic field distribution. In this way, ballistic Hall probes have already
been studied and used successfully. Here, the response function of a Hall
sensor is determined in the diffusive regime, which allows this device to be
used as a magnetosensor for the determination of inhomogeneous magnetic field
distribtutions. Furthermore, the influence of the geometry of the Hall bar on
this response function, such as circular corners and asymmetry in the probes,
is also investigated and appears to be non-negligible.
