We study the effects of magnetic anisotropy and crystalline axes in surface acoustic waves (SAWs) driven magnetic resonances of $\mathrm{Ni}/{\mathrm{Li}\mathrm{Nb}\mathrm{O}}_3$ hybrid devices. SAW absorption from the interaction with magnons in $\mathrm{Ni}$ displays a strong anisotropic dependence on the direction of the applied in-plane magnetic field. Magnetic anisotropy is further investigated by magneto-optical Kerr effect measurements to show both uniaxial and biaxial anisotropy components in $\mathrm{Ni}$ films on ${\mathrm{Li}\mathrm{Nb}\mathrm{O}}_3$. By introducing a dipolar interaction term in addition to the anisotropies, we successfully explain the anisotropic SAW absorption in our devices. These findings show the significance of substrate-induced anisotropy and long-range dipolar effects in magnon-phonon hybrid devices and indicate future directions for optimizing these spin-acoustic devices through comprehensive anisotropy engineering.

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• Acoustic phonons
• Magnetic anisotropy
• Magneto-optical Kerr effect
• Magnetoelastic effect
• Magnons
• Spin dynamics
• Spin waves
• Surface acoustic wave