Magnetic Control of Acoustic Resonators and Metamaterials

Abstract

The magneto-elastic coupling between spin and acoustic excitations offers an excellent opportunity to combine, within the same signal processing devices, the magnetic tuneability and re-programmability inherent to magnonics with the energy efficiency of phononics. Relevant recent studies have focused on characterisation of the interaction strength in magnetoacoustic devices and on the excitation and detection of an acoustically induced magnetic signal. The work presented in this thesis focuses on the magnetic control of propagating acoustic waves, with the aim to reveal and to characterise the signatures of the magneto-elastic coupling in reflection and transmission of acoustic waves in magnetoacoustic metamaterials, and to explore their tuning using magnetic stimuli.