  Spin-charge interconversion (SCI) is a central phenomenon to the development
of spintronic devices from materials with strong spin-orbit coupling (SOC). In
the case of materials with high crystal symmetry, the only allowed SCI
processes are those where the spin current, charge current and spin
polarization directions are orthogonal to each other. Consequently, standard
SCI experiments are designed to maximize the signals arising from the SCI
processes with conventional mutually orthogonal geometry. However, in
low-symmetry materials, certain non-orthogonal SCI processes are also allowed.
Since the standard SCI experiment is limited to charge current flowing only in
one direction in the SOC material, certain allowed SCI configurations remain
unexplored. In this work, we performed a thorough SCI study in a graphene-based
lateral spin valve combined with low-symmetry MoTe$_2$. Due to a very low
contact resistance between the two materials, we could detect SCI signals using
both a standard configuration, where the charge current is applied along the
MoTe$_2$, and a recently introduced (3D-current) configuration, where the
charge current flow can be controlled in three directions within the
heterostructure. As a result, we observed three different SCI components, one
orthogonal and two non-orthogonal, giving new insight into the SCI processes in
low-symmetry materials. The large SCI signals obtained at room temperature,
along with the versatility of the 3D-current configuration, provide feasibility
and flexibility to the design of the next generation of spin-based devices.
