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Journal Articles Physical Review B Year : 2021

Evidence of interfacial asymmetric spin scattering at ferromagnet-Pt interfaces

Abstract

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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Dates and versions

hal-03229381 , version 1 (19-05-2021)

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van Tuong Pham, Van Tuong Pham, Maxen Cosset-Chéneau, Ariel Brenac, Olivier Boulle, et al.. Evidence of interfacial asymmetric spin scattering at ferromagnet-Pt interfaces. Physical Review B, 2021, 103, pp.L201403. ⟨10.1103/PhysRevB.103.L201403⟩. ⟨hal-03229381⟩
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