  We consider how superconducting correlations influence spin-transfer torques
in ferromagnetic superconductors. It is demonstrated that there is a novel
torque arising from particle-hole interference that depends on the U(1) phase
associated with the superconducting order parameter. We also show that there is
an equilibrium exchange torque between two ferromagnetic superconductors in
contact via a normal metal mediated by Andreev states. The latter equilibrium
magnetic torque is also sensitive to spin-resolved phase differences in the
superconducting order parameters as well as to an externally applied phase
difference.
