Spin Hall metals with a giant spin Hall ratio θSH and relatively low resistivity are key to developing spin-orbit-torque-based technologies ($e.g.$ memory, logic, and oscillators) that require high energy efficiency, high endurance, and low impedance. The limit to which θSH can be enhanced in practice, and how, remain to be seen. This study establishes that the intrinsic spin Hall conductivity of Pt is robust against strain and moderate crystal disorder, but diminishes with carrier lifetime, which sets a practical limit for θSH. Finally, an actual Pt/Ti multilayer near this limit is identified.
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A 2019 study studied this question.
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