Relation spin hall and inverse spin hall

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I have a basic question about the spin hall effect and the inverse spin hall effect (SHE):

Let's take a material like Pt, which has a high SHE. Typically the spin hall conductivity (spin current over electric field) = 300 ohm^-1 cm^-1. However, it is also used for measurements using the inverse effect (ISHE). However, when using the ISHE effect a high spin hall conductivity is not beneficial, because the resulting electric field will scale with the reciprocal of the spin hall conductivity. So I would conclude that a high SHE would automatically result in a low ISHE "efficiency". Or am I using these equations wrong?
 

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