  Motivated by the recent experimental realization of a quantum interference
transistor based on the superconducting proximity effect, we here demonstrate
that the inclusion of a textured ferromagnet both strongly enhances the flux
sensitivity of such a device and additionally allows for singlet-triplet
switching by tuning a bias voltage. This functionality makes explicit use of
the induced spin-triplet correlations due to the magnetic texture. Whereas the
existence of such triplet correlations is well-known, our finding demonstrates
how spin-triplet superconductivity may be utilized for concrete technology,
namely to improve the functionality of ultra-sensitive magnetometers.
