Near-unity spin Hall ratio inNixCu1−xalloys
| Autor: | Justin M. Shaw, Erna Krisztina Delczeg-Czirjak, Katy S. Gerace, Thomas J. Silva, Mark W. Keller, Monika Arora |
|---|---|
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Physical Review B. 99 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.99.214411 |
| Popis: | We report a large spin Hall effect in the $3d$ transition metal alloy $\mathrm{N}{\mathrm{i}}_{x}\mathrm{C}{\mathrm{u}}_{1\ensuremath{-}x}$ for $x\ensuremath{\in}{0.3,0.75}$, detected via the ferromagnetic resonance of a permalloy ($\mathrm{Py}=\mathrm{N}{\mathrm{i}}_{80}\mathrm{F}{\mathrm{e}}_{20}$) 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 ${\ensuremath{\theta}}_{\mathrm{SH}}\ensuremath{\approx}1,$ spin diffusion length ${\ensuremath{\lambda}}_{\mathrm{s}}$, spin mixing conductance ${G}_{\ensuremath{\uparrow}\ensuremath{\downarrow}}^{}$, and damping due to spin memory loss ${\ensuremath{\alpha}}_{\mathrm{SML}}$. 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 $\mathrm{N}{\mathrm{i}}_{x}\mathrm{C}{\mathrm{u}}_{1\ensuremath{-}x}$ alloys, although the experiments here cannot distinguish between extrinsic and intrinsic mechanisms. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|