Experimental study of extrinsic spin Hall effect in CuPt alloy

Abstract

We have experimentally studied the effects on the spin Hall angle due to systematic addition of Pt into the light metal Cu. We perform spin torque ferromagnetic resonance measurements on Py/CuPt bilayer and find that as the Pt concentration increases, the spin Hall angle of CuPt alloy increases. Moreover, only 28% Pt in CuPt alloy can give rise to a spin Hall angle close to that of Pt. We further extract the spin Hall resistivity of CuPt alloy for different Pt concentrations and find that the contribution of skew scattering is larger for lower Pt concentrations, while the side-jump contribution is larger for higher Pt concentrations. From technological perspective, since the CuPt alloy can sustain high processing temperatures and Cu is the most common metallization element in the Si platform, it would be easier to integrate the CuPt alloy based spintronic devices into existing Si fabrication technology.

Accepted for publication in Physical Review Applied

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• Disentanglement of intrinsic and extrinsic side-jump scattering induced spin Hall effect in N-implanted Pt
• Experimental Evidence of Non-Negligible Imaginary Part of Spin Mixing Conductance and Its Impact on Magnetization Dynamics in Heavy-Metal|Ferromagnet Bilayers
• Extrinsic-Intrinsic Crossover of the Spin Hall Effect Induced by Alloying
• Spin Hall effect from hybridized 3$d$-4$p$ orbitals
• Role of the chiral spin configuration in field-free spin-orbit torque-induced magnetization switching by a locally injected spin current
• Supercurrent-induced long-range triplet correlations and controllable Josephson effect in superconductor/ferromagnet hybrids with extrinsic SOC
• Spin Hall effect originated from fractal surface
• Temperature dependence of charge-to-spin conversion in rhombohedral (110) bismuth thin film
• Spin-orbit torque: Moving towards two-dimensional van der Waals heterostructures