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Abstract: We have demonstrated the electrical generation and detection of spinpolarization by the spin Hall effect SHE in platinum. The experiment wasperformed in a non-local geometry without the use of ferromagnetic materials ormagnetic field. We designed a circuit that uses the SHE to convert a chargecurrent to a spin current, and the inverse SHE to convert the spin current backinto a charge signal. The experiments were carried out for temperatures from 10K up to 290 K. We extracted the spin Hall conductivity and spin diffusionlength from the data with the aid of a spin diffusion model, and found thevalues of 1.1 $\times 10^6$ $\Omega^{-1}$m$^{-1}$ and 80~nm, respectively, at290 K. The spin Hall conductivity is two orders of magnitudes larger than theprevious record of $3.3\times10^4$ $\Omega^{-1}$m$^{-1}$. This observation mayhave many potential applications in spintronics devices.



Author: Chee Weng Koong, Berthold-Georg Englert, Christian Miniatura, N. Chandrasekhar

Source: https://arxiv.org/



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