  Spin-orbital textures in topological insulators due to the spin locking with
the electron momentum, play an important role in spintronic phenomena that
arise from the interplay between charge and spin degrees of freedom. We have
explored interfaces between a ferromagnetic system (CrI$_3$) and a topological
insulator (Bi$_2$Se$_3$) that allow the manipulation of spin-orbital textures.
Within an {\it ab initio} approach we have extracted the spin-orbital-textures
dependence of experimentally achievable interface designs. The presence of the
ferromagnetic system introduces anisotropic transport of the electronic spin
and charge. From a parameterized Hamiltonian model we capture the anisotropic
backscattering behavior, showing its extension to other
ferromagnetic/topological insulator interfaces. We verified that the van der
Waals TI/MI interface is an excellent platform for controlling the spin degree
of freedom arising from topological states, providing a rich family of
unconventional spin texture configurations.
