Anisotropy, arising from reduced symmetry in material systems, has significant implications for both fundamental science and technological applications. Despite its importance, fully understanding and harnessing anisotropy for controlling spin current generation in practical scenarios has been challenging. In this study, we introduce an approach to generate anisotropic spin current, using facet-controlled anisotropic energy densities in yttrium iron garnet (${\mathrm{Y}}_3{\mathrm{Fe}}_5{\mathrm{O}}_{12}$, YIG), through spin pumping and inverse spin Hall effect measurements. The cubic symmetry in YIG (001) generates a fourfold anisotropic spin current, which significantly influences spin pumping into the $\mathrm{Pt}$ layer. In contrast, the circular symmetry in YIG (111) results in an isotropic spin current. This leads to controlled anisotropic magnon transport, enabling the development of tunable magnonic devices and circuits.

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• Magnetic anisotropy
• Magnetism
• Spin current
• Spin pumping
• Spintronics
• Ferromagnetic resonance