Abstract We report on the enhancement of the spin Hall conductivity in tungsten by alloying with copper, measured by using the spin-torque ferromagnetic resonance technique. The alloying leads to an increase in spin-dependent scattering events and results in an enhancement of the contributing extrinsic spin Hall effects. The measured damping property shows a slight increase with higher tungsten concentration, due to spin current losses from the ferromagnetic layer into the tungsten-copper alloy. At a tungsten concentration of 60%, the spin Hall conductivity reaches a maximum of 3.68 ± 0.68 × 10 5 Ω - 1 m - 1 , corresponding to an enhancement of 120% compared to the pure tungsten sample. At the same concentration, the ratio of the spin Hall angle to the damping of the ferromagnetic layer, which offers a quick estimation for the critical switching current density, is found to be four times smaller as compared to pure tungsten.

中文翻译：

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钨铜合金中增强的自旋霍尔电导率

摘要 我们报告了通过与铜合金化来增强钨的自旋霍尔电导率，使用自旋扭矩铁磁共振技术测量。合金化导致与自旋相关的散射事件增加，并导致有助于外在自旋霍尔效应的增强。由于从铁磁层到钨铜合金的自旋电流损失，测量的阻尼特性随着钨浓度的升高而略有增加。在 60% 的钨浓度下，自旋霍尔电导率达到 3.68 ± 0.68 × 10 5 Ω - 1 m - 1 的最大值，与纯钨样品相比提高了 120%。在相同浓度下，自旋霍尔角与铁磁层阻尼的比值，