期刊
PHYSICAL REVIEW B
卷 106, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.144415
关键词
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资金
- Israel Science Foundation [1217/21]
- Peter Brojde Center for Innovative Engineering and Computer Science
- Center for Nanoscience and Nanotechnology of the Hebrew University of Jerusalem
The Ferris FMR is a wideband and highly sensitive ferromagnetic resonance method that measures the absorption line rather than its derivative, with at least an order of magnitude higher sensitivity compared to conventional FMR systems. Using this method, spin currents generated from the orbital Hall effect in pure Cu and Al are reported. Cu exhibits a large effective spin Hall angle exceeding that of Pt, while Al possesses an orbital Hall effect of opposite polarity as predicted by theory.
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.
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