Detection of Acoustic Oscillations Excited by Strong Magnetoelastic Coupling in an Antiferromagnetic α-Fe2O3/Pt Heterostructure

Abstract: Acoustic spin pumping from the antiferromagnet α-Fe2O3 into a normal metal (Pt) was experimentally investigated. It was demonstrated that the excitation of acoustic resonance in hema-tite leads to spin accumulation at the interface with Pt and the generation of charge currents, which are detected via the inverse spin Hall effect (ISHE). An equivalent radiotechnical circuit has been proposed and implemented, enabling a qualitative descrip-tion of the interaction between the elastic and magnetic subsys-tems, as well as the parameters of the resonator.

Keywords: magnetoacoustics, spintronics, equiv-alent circuit, magnetoelastic coupling, inverse spin hall effect, α-fe2o3, hematite, antiferromagnet, acoustic resonance, spin pumping