Effect of Biaxial magentic anisotropy on magnetoelastic wave in Ni/LiNbiO3 Hybrid Device

We study the effects of magnetic anisotropy and crystalline axes in the surface acoustic wave (SAW) driven magnetic resonances of Ni/LiNbO₃ hybrid devices. SAW absorption from the interaction with magnons in Ni display strong anisotropic dependence on the direction of the applied in-plane magnetic field. The magnetic anisotropy is further investigated by magneto-optical Kerr effect (MOKE) measurements to show both uniaxial and biaxial anisotropy components in the Ni films on LiNbO₃. 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 importance of both substrate-induced anisotropy and long-range dipolar effects in SAW–magnon hybrid devices and indicate future directions for optimizing these spin-acoustic devices through comprehensive anisotropy engineering.