Lack of correlation between the spin mixing conductance and the ISHE-generated voltages in CoFeB/Pt,Ta bilayers

Abstract

We investigate spin pumping phenomena in polycrystalline CoFeB/Pt and CoFeB/Ta bilayers and the correlation between the effective spin mixing conductance $g_{\mathrm{eff}}^{\uparrow \downarrow }$ 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 $g_{\mathrm{eff}}^{\uparrow \downarrow }$ 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.

arXiv comment6 Pages, 5 Figures

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Cited by in corpus (18)

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• Large spin current generation by the spin Hall effect in mixed crystalline phase Ta thin films
• Origin of Strong Two-Magnon Scattering in Heavy Metal/Ferromagnet/Oxide Heterostructures
• Determination of spin Hall angle in heavy metal/CoFeB-based heterostructures with interfacial spin-orbit fields
• Relative weight of the inverse spin Hall and spin rectification effects for metallic Py,Fe/Pt and insulating YIG/Pt bilayers estimated by angular dependent spin pumping measurements
• Large spin Hall angle and spin mixing conductance in highly resistive antiferromagnetic Mn2Au
• Separation of the two-magnon scattering contribution to damping for the determination of the spin mixing conductance
• Spin-pumping through a varying-thickness MgO interlayer in Fe/Pt system
• Experimental Evidence of Non-Negligible Imaginary Part of Spin Mixing Conductance and Its Impact on Magnetization Dynamics in Heavy-Metal|Ferromagnet Bilayers
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• Evidence of Pure Spin-Current Generated by Spin Pumping in Interface Localized States in Hybrid Metal-Silicon-Metal Vertical Structures
• Enhancement of spin mixing conductance in La${}_{0.7}$Sr${}_{0.3}$MnO${}_3$/LaNiO${}_3$/SrRuO${}_3$ heterostructures
• Spin transport and magnetic proximity effect in CoFeB/normal metal/Pt trilayers
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• A Microscopic Explanation of Microwave Spin Pumping