Exploring orbital-charge conversion mediated by interfaces with copper through spin-orbital pumping
arXiv:2309.08857 · doi:10.1103/PhysRevB.109.014420
Abstract
We investigated how different materials affect the orbital-charge conversion in heterostructures with the naturally oxidized cooper capping layer. When we added a thin layer of onto yttrium iron garnet stacks, we observed a significant reduction in the charge current signal measured by means the spin pumping effect technique. This finding contrasts with the results of a prior study conducted on YIG/Pt/CuOx, which reported the opposite effect. On the other hand, when we added the same layer to structures, there was not much change in the spin pumping signal. This occurred because Ti does not generate much orbital current at the interface, unlike Pt, due to its weaker spin-orbit coupling. Interestingly, when we added the layer to structures, the spin pumping signal increased. However, in structures, the signal decreased. Finally, we delve into a theoretical analysis of the spin (orbital) Hall effect in YIG/Heavy-metal systems. These findings have the potential to advance research in the innovative field of orbitronics and contribute to the development of new technologies based on spin-orbital conversion.
arXiv comment21 pages, 6 figures,
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- Orbital Pumping in Ferrimagnetic Insulators
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- Controlling the orbital Hall effect in gapped bilayer graphene in the terahertz regime
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