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  • Title: Near-unity spin Hall ratio in Ni x Cu1-x alloys.
    Author: Keller MW, Gerace KS, Arora M, Delczeg-Czirjak EK, Shaw JM, Silva TJ.
    Journal: Phys Rev B; 2019; 99():. PubMed ID: 31579293.
    Abstract:
    We report a large spin Hall effect in the 3d transition metal alloy Ni x Cu1-x for x ∈ {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 θ SH ≈ 1, spin diffusion length λs, spin mixing conductance G ⇅, and damping due to spin memory loss αSML. 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 Ni x Cu1-x alloys, although the experiments here cannot distinguish between extrinsic and intrinsic mechanisms.
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