  Most astrophysical accretion disks are likely to be warped. In X-ray binaries
the spin evolution of an accreting neutron star is critically dependent on the
interaction between the neutron star magnetic field and the accretion disk.
There have been extensive investigations on the accretion torque exerted by a
coplanar disk that is magnetically threaded by the magnetic field lines from
the neutron stars, but relevant works on warped/tilted accretion disks are
still lacking. In this paper we develop a simplified two-component model, in
which the disk is comprised of an inner coplanar part and an outer, tilted
part. Based on standard assumption on the formation and evolution of the
toroidal magnetic field component, we derive the dimensionless torque and show
that a warped/titled disk is more likely to spin up the neutron star compared
with a coplanar disk.We also discuss the possible influence of various initial
parameters on the torque.
