  Spin valves incorporating perpendicularly magnetized materials are promising
structures for memory elements and high-frequency generators. We report the
angular dependence of the spin-transfer torque in spin valves with
perpendicular equilibrium magnetization computed by first-principles circuit
theory and compare results with experiments by W.H. Rippard c.s. [Phys. Rev. B
81, 014426 (2010)] on the CoFe|Cu|CoNi system. Furthermore, we predict a
non-monotonous ("wavy") spin-transfer torque when the Cu spacer is replaced by
a Ru layer.
