  The spin-to-charge current interconversion in bilayers composed of
ferromagnetic and nonmagnetic layers with strong spin-orbit coupling has
garnered considerable attention due to its exceptional potential in advancing
spintronics devices for data storage and logic applications. Platinum (Pt)
stands out as one of the most effective materials for generating spin current.
While the spin conversion efficiency is isotropic in polycrystalline Pt
samples, an ongoing debate persists regarding its dependence on the crystalline
direction in single crystalline samples. In this study, we aim to
comprehensively evaluate the in-plane anisotropy of spin-charge interconversion
using an array of complementary Spin Hall and inverse Spin Hall techniques with
both incoherent and coherent excitation. Specifically, we investigate the
spin-to-charge interconversion in epitaxial, (111)-oriented, Co/Pt bilayers
with low surface roughness, as resulted from x-ray experiments. By varying the
thickness of the Pt layer, we gain insights into the spin-charge
interconversion in epitaxial Pt and highlight the effects of the interfaces.
Our results demonstrate an isotropic behavior within the limits of our
detection uncertainty. This finding significantly enhances our understanding of
spin conversion in one of the most relevant systems in spintronics and paves
the way for future research in this field.
