Generation of spin currents by the orbital Hall effect in Cu and Al and their measurement by a Ferris-wheel ferromagnetic resonance technique at the wafer level

Amit Rothschild, Nadav Am-Shalom, Nirel Bernstein, Ma'yan Meron, Tal David, Benjamin Assouline, Elichai Frohlich, Jiewen Xiao, Binghai Yan, Amir Capua

פרסום מחקרי: פרסום בכתב עתמאמרביקורת עמיתים

תקציר

We present a ferromagnetic resonance (FMR) method that we term the "Ferris" FMR. It is wideband, has at least an order of magnitude higher sensitivity as compared to conventional FMR systems, and measures the absorption line rather than its derivative. It is based on large-amplitude modulation of the externally applied magnetic field that effectively magnifies signatures of the spin-transfer torque making its measurement possible even at the wafer level. Using the Ferris FMR, we report the generation of spin currents from the orbital Hall effect taking place in pure Cu and Al. To this end, we use the spin-orbit coupling of a thin Pt layer introduced at the interface that converts the orbital current to a measurable spin current. While Cu reveals a large effective spin Hall angle exceeding that of Pt, Al possesses an orbital Hall effect of opposite polarity in agreement with the theoretical predictions. Our results demonstrate additional spin-and orbit functionality for two important metals in the semiconductor industry beyond their primary use as interconnects with all the advantages in power, scaling, and cost.
שפה מקוריתאנגלית
מספר המאמר144415
מספר עמודים7
כתב עתPhysical review. B
כרך106
מספר גיליון14
מזהי עצם דיגיטלי (DOIs)
סטטוס פרסוםפורסם - 1 אוק׳ 2022

ASJC Scopus subject areas

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  • ???subjectarea.asjc.3100.3104???

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