Evidence of interfacial asymmetric spin scattering at ferromagnet-Pt interfaces

Abstract

We measure the spin-charge interconversion by the spin Hall effect in ferromagnetic/Pt nanodevices. The extracted effective spin Hall angles (SHAs) of Pt evolve drastically with the ferromagnetic (FM) materials (CoFe, Co, and NiFe), when assuming transparent interfaces and a bulk origin of the spin injection/detection by the FM elements. By carefully measuring the interface resistance, we show that it is quite large and cannot be neglected. We then evidence that the spin injection/detection at the FM/Pt interfaces are dominated by the spin polarization of the interfaces. We show that interfacial asymmetric spin scattering becomes the driving mechanism of the spin injection in our samples.

arXiv comment10 pages, 4 figures

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• Emergence of large spin-charge interconversion at an oxidized Cu/W interface
• Spin-to-charge conversion by spin pumping in sputtered polycrystalline Bi${}_x$Se${}_{1-x}$
• Quantification of spin-charge interconversion in highly resistive sputtered Bi${}_x$Se${}_{1-x}$ with non-local spin valves
• Measuring the magnetic anisotropy of the spin Hall effect and spin relaxation length in nickel and permalloy via electrical spin injection