  Materials with strong spin-orbit coupling and low crystalline symmetry are
promising for generating large unconventional spin-orbit torques (SOTs), such
as in-plane field-like (FL) torques and out-of-plane damping-like (DL) torques,
which can effectively manipulate and deterministically switch an out-of-plane
magnetization without the need for additional external in-plane magnetic
fields. Here, we report SOTs generated by magnetron-sputtered 1T'
MoTe2/Permalloy (Py; Ni80Fe20)/MgO heterostructures using both spin-torque
ferromagnetic resonance (ST-FMR) and second harmonic Hall measurements. We
observed unconventional FL and DL torques in our samples due to spins polarized
normal to the interface of MoTe2 and Py layers, and studied the influence of
crystallographic order and MoTe2 layer thickness on the SOTs. By comparing the
Raman spectra of 1T' MoTe2 samples prepared in different ways, we found a
tensile strain in sputtered MoTe2 films, which might further enhance the
generation of unconventional torques by reducing the symmetry of 1T' MoTe2.
