Giant spin Hall conductivity in platinum at room temperature

Details Giant spin Hall conductivity in platinum at room temperature Giant spin Hall conductivity in platinum at room temperature

2010-04-08

arxiv.org/abs/1004.1273v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

We have demonstrated the electrical generation and detection of spin polarization by the spin Hall effect (SHE) in platinum. The experiment was performed in a non-local geometry without the use of ferromagnetic materials or magnetic field. We designed a circuit that uses the SHE to convert a charge current to a spin current, and the inverse SHE to convert the spin current back into a charge signal. The experiments were carried out for temperatures from 10 K up to 290 K. We extracted the spin Hall conductivity and spin diffusion length from the data with the aid of a spin diffusion model, and found the values of 1.1 $\times 10^6$ $\Omega^{-1}$m$^{-1}$ and 80~nm, respectively, at 290 K. The spin Hall conductivity is two orders of magnitudes larger than the previous record of $3.3\times10^4$ $\Omega^{-1}$m$^{-1}$. This observation may have many potential applications in spintronics devices.

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