Magnetoacoustic waves controlled by in-plane uniaxial magnetic anisotropy

Abstract

Controlling the magnetoacoustic wave transmission with various equivalent magnetic fields is a key technology for future hybrid surface acoustic wave (SAW) devices. In this work, we experimentally and theoretically display acoustically driven spin wave resonance in Ni films with in-plane uniaxial magnetic anisotropy at an arbitrary angle relative to the SAW vector. Our experimental results show that by adjusting the angle between the hard axis and the SAW vector, we achieve the excitation of magnetoacoustic waves in any in-plane orientation. Moreover, we clearly prove that the anisotropic effective field can be utilized to optimize the applied field configuration for driving magnetoacoustic waves and design orientation sensors due to the angle-sensitive performance of acoustic spin wave resonance.