The role of metallic nanoparticles in the enhancement of the spin Hall magnetoresistance in YIG/Pt thin films

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:466

Article

Gamino, M.¹  Silva, E. F.¹  Alves Santos, O.¹  Mendes, J. B. S.²  Rodriguez-Suarez, R. L.³  Machado, F. L. A.¹  Azevedo, A.¹  Rezende, S. M.¹ 

[1] Univ Fed Pernambuco, Dept Fis, BR-50670901 Recife, PE, Brazil

[2] Univ Fed Vicosa, Dept Fis, BR-36570900 Vicosa, MG, Brazil

[3] Pontificia Univ Catolica Chile, Fac Fis, Casilla 306, Santiago, Chile

关键词: Spin Hall effect;    Spin current;    Spin Hall magnetoresistance;   

DOI  :  10.1016/j.jmmm.2018.07.008

来源: Elsevier

【 摘 要 】

Enhancements in the spin Hall magnetoresistance (SMR) close to one order of magnitude in bilayers of yttrium iron garnet (YIG) and platinum with embedded metallic nanoparticles of Ag and Cu are reported. The enhancement in the electrical detection of the back reflected spin current in YIG/Pt-MP(t(MP))-Pt relative to YIG/Pt is attributed to the increase in the effective spin Hall angle (theta(eff)(SHA) ) due to the presence of the metallic nanoparticles. The maximum value observed for the spin Hall magnetoresistance is related to critical thickness of the t(MP) close to the percolation threshold. The results are also supported by data obtained by means of the spin pumping effect where dc-voltage measurements confirm the enhancement of the spin to charge conversion process.

【 授权许可】

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