Characterization of spin current to charge current conversion via ISHE effect by Spin Pumping in YIG/Bi bilayers

Abstract

Resumen del póster presentado al 10th International Symposium on Metallic Multilayers (MML), celebrado en Madrid (España) del 17 al 21 de junio de 2019.Spin Pumping technics have been used here in a YIG//Bi bilayer structure to generate a pure spin current flowing within the Bi metallic layer, in order to measure spin to charge conversion parameters. This spin to charge conversion, is observed in the metallic (Bi) layer as a result of the Inverse Spin Hall Effect (ISHE), widely documented in literature. After setting up an external static magnetic field, Ferromagnetic Resonance (FMR) h as been excited within the magnetic layer (YIG) of the samples, using a broadband shorted microstrip RF setup. A pure spin current is obtained in the Bi metallic layer, where Spin Orbit Interaction (SOI) gives rise to a selective scattering, resulting in perpendicular charge current, which has been measured, directly, or via the voltage induced by this current on the sample edges. YIG magnetic insulator layer in place of a conducting one has been chosen to avoid superposition of unwanted electric signals under resonance condition as done in ref [3]. The dependences of the measured ISHE Voltage with frequency, metallic layer thickness, static magnetic field angle and radiofrequency power have been measured and analysed. Results were compared with those obtained in references (where a conducting magnetic layer was used), (where Platinum was used as metallic layer in place of Bismuth) and (where the same bilayer nanostructure YIG//Bi was analysed in a RF monofrequency cavity setup) Finally, the evolution of the ISHE voltage with ageing of the samples has been observed and systematically investigated.Peer reviewe