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Near-unity spin Hall ratio in Ni_xCu_(1-x) alloys

机译:Ni_xcu_(1-x)合金中的近乎统一旋转霍尔比

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摘要

We report a large spin Hall effect in the 3d transition metal alloy NixCu1-x for x is an element of {0.3, 0.75}, detected via the ferromagnetic resonance of a permalloy (Py = Ni80Fe20) film deposited in a bilayer with the alloy. A thickness series at x = 0.6, for which the alloy is paramagnetic at room temperature, allows us to determine the spin Hall ratio theta(SH) approximate to 1, spin diffusion length lambda(s), spin mixing conductance G(up arrow down arrow) and damping due to spin memory loss alpha(SML). We compare our results with similar experiments on Py/Pt bilayers measured using the same method. Ab initio band structure calculations with disorder and spin-orbit coupling suggest an intrinsic spin Hall effect in NixCu1-x alloys, although the experiments here cannot distinguish between extrinsic and intrinsic mechanisms.
机译:我们在3D过渡金属合金Nixcu1-X中报告了大型旋转霍尔效应,X是通过沉积在双层中的渗透合金(PY = Ni80Fe20)薄膜的铁磁共振检测的{0.3,0.75}的元素。 x = 0.6的厚度系列,合金在室温下是顺磁,允许我们确定旋转霍尔比θ(sh)近似为1,旋转扩散长度λ,旋转混合电导g(向上箭头箭头)和阻尼由于自旋记忆丢失α(SML)。我们将结果与使用相同方法测量的Py / Pt双层的类似实验进行比较。 AB Initio带结构计算紊乱和旋转轨道偶联表明NixCu1-X合金中的内在旋转霍尔效应,尽管这里的实验无法区分外在和内在机制。

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