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arXiv · 2011.12207

Evidence of interfacial asymmetric spin scattering at ferromagnet-Pt interfaces

Van Tuong Pham·Maxen Cosset-Cheneau·Ariel Brenac·Olivier Boulle·Alain Marty·Jean-Philippe Attané·Laurent Vila
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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.

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Van Tuong Pham, Maxen Cosset-Cheneau, Ariel Brenac, Olivier Boulle, Alain Marty, Jean-Philippe Attané, Laurent Vila. 2020-11-24. Evidence of interfacial asymmetric spin scattering at ferromagnet-Pt interfaces. https://doi.org/10.1103/physrevb.103.l201403

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