doi:10.1088/1361-6463/ac0ca5engSangiao Barral, SorayaMorales Aragonés, José IgnacioLucas del Pozo, IreneJiménez Cavero, PilarMorellón Alquézar, LuisSánchez Azqueta, CarlosDe Teresa Nogueras, José MaríaOptimization of YIG/Bi stacks for spin-to-charge conversion and influence of agingART-2021-124562We show that an optimized growth of magnetic layer/non-magnetic layer stacks allows for the improvement of the spin-to-charge conversion efficiency. From the analysis of the voltage signal generated in spin pumping experiments due to the inverse spin Hall effect (ISHE) on Y3Fe5O12 (YIG)/Bi stacks, we have determined values for the spin Hall angle and the spin-diffusion length in Bi of 0.0068(8) and 17.8(9) nm, respectively. Based on these results, we have also studied the influence of aging on the spin-to-charge conversion efficiency by performing spin pumping experiments on YIG/Bi stacks after exposing the samples to ambient conditions for several days and up to 150 days. We have found that in YIG/Bi samples with Bi thicknesses around or below the spin-diffusion length, the ISHE voltage signal is still above 80% of its initial value after 100 days.2021http://zaguan.unizar.es/record/10937410.1088/1361-6463/ac0ca5http://zaguan.unizar.es/record/109374oai:zaguan.unizar.es:109374info:eu-repo/grantAgreement/ES/DGA-FSE/E13-20Rinfo:eu-repo/grantAgreement/ES/MEC/FPU014-02546info:eu-repo/grantAgreement/ES/MICINN/MAT2017-82970-C2-1-Rinfo:eu-repo/grantAgreement/ES/MICINN/MAT2017-82970-C2-2-RJOURNAL OF PHYSICS D-APPLIED PHYSICS 54, 37 (2021), 375305 [7 pp.]by-nc-ndhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccess