Lack of correlation between the spin-mixing conductance and the inverse spin Hall effect generated voltages in CoFeB/Pt and CoFeB/Ta bilayers
| Autor: | Sascha Keller, Björn Heinz, M. R. Schweizer, A. Conca, E. Th. Papaioannou, Burkard Hillebrands |
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| Rok vydání: | 2017 |
| Předmět: |
Spin pumping
Materials science Condensed matter physics Conductance Inverse 02 engineering and technology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Magnetostatics 01 natural sciences Hall effect 0103 physical sciences Spin Hall effect Proximity effect (superconductivity) Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Spin-½ |
| Zdroj: | Physical Review B. 95 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.95.174426 |
| Popis: | We investigate spin pumping phenomena in polycrystalline CoFeB/Pt and CoFeB/Ta bilayers and the correlation between the effective spin-mixing conductance ${g}_{\mathrm{eff}}^{\ensuremath{\uparrow}\ensuremath{\downarrow}}$ and the obtained voltages generated by the spin-to-charge current conversion via the inverse spin Hall effect in the Pt and Ta layers. For this purpose, we measure the in-plane angular dependence of the generated voltages on the external static magnetic field and we apply a model to separate the spin pumping signal from the one generated by the spin rectification effect in the magnetic layer. Our results reveal a dominating role of anomalous Hall effect for the spin rectification effect with CoFeB and a lack of correlation between ${g}_{\mathrm{eff}}^{\ensuremath{\uparrow}\ensuremath{\downarrow}}$ and inverse spin Hall voltages pointing to a strong role of the magnetic proximity effect in Pt in understanding the observed increased damping. This is additionally reflected on the presence of a linear dependency of the Gilbert damping parameter on the Pt thickness. |
| Databáze: | OpenAIRE |
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