Evidence of interfacial asymmetric spin scattering at ferromagnet-Pt interfaces
Résumé
We measure the spin-charge interconversion by the spin Hall effect in various ferromagnetic/Pt nanodevices.
The extracted effective spin Hall angles 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 estimating 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.
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