Spin-to-charge conversion and interface-induced spin Hall magnetoresistance in yttrium iron garnet/metallic bilayers

J Holanda; O Alves Santos; J B S Mendes; S M Rezende

doi:10.1088/1361-648X/ac16f7

Spin-to-charge conversion and interface-induced spin Hall magnetoresistance in yttrium iron garnet/metallic bilayers

J Phys Condens Matter. 2021 Aug 13;33(43). doi: 10.1088/1361-648X/ac16f7.

Authors

J Holanda¹, O Alves Santos², J B S Mendes³, S M Rezende⁴

Affiliations

¹ Departamento de Física, Universidade Federal do Espírito Santo, 29075-910, Vitória, ES, Brazil.
² Physics of Nanodevices, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, Groningen, AG 9747, The Netherlands.
³ Departamento de Física, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil.
⁴ Departamento de Física, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil.

PMID: 34293724
DOI: 10.1088/1361-648X/ac16f7

Abstract

We report the investigation of spin-to-charge current interconversion process in hybrid structures of yttrium iron garnet (YIG)/metallic bilayers by means of two different experimental techniques: spin pumping effect (SPE) and spin Hall magnetoresistance (SMR). We demonstrate the evidence of a correlation between spin-to-charge conversion and SMR in bilayers of YIG/Pd, YIG/Pt, and YIG/IrMn. The correlation was verified directly in the spin Hall angles and the amplitudes of the voltage signals measured by the SPE and SMR techniques. The detection of SMR was carried out using the modulated magnetoresistance technique and lock-in amplifier detection. For these measurements, we present a simple model for the interpretation of the results. The results allow us to conclude that indeed the interface in the YIG/metallic bilayers has a dominant role in the spin-to-charge current conversion and SMR.

Keywords: Hall; charge; conversions; interface-induced; spin.