Giant, Linearly Increasing Spin-Orbit Torque Efficiency in Symmetry-Broken Spin-Orbit Torque Superlattices.
basic_science · Level V
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- Record sourced from PubMed, PMID 37831813.
- Also identified by DOI 10.1021/acs.nanolett.3c02823.
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Abstract
Magnetic heterostructures with high spin-orbit torque efficiency and low impedance have great promise for low-power spintronic technologies. We report a symmetry-broken spin-orbit superlattice [Pt<sub>0.75</sub>Cu<sub>0.25</sub>/Co/Ta]<sub><i>n</i></sub>, in which the dampinglike spin-orbit torque efficiency accumulates linearly with the repeat number <i>n</i> and achieves a giant value of >200% when <i>n</i> = 16, which is 100 times stronger than that of a conventional magnetic heterostructure with a clean Pt (e.g., 2% at a resistivity of 7 μΩ cm). The giant spin-orbit torque effect arises predominantly from the spin Hall effect of Pt<sub>0.75</sub>Cu<sub>0.25</sub>. The anomalous Nernst effect increases remarkably as the repeat number <i>n</i> increases, implying a critical need to include the thermal effect in the analysis of magnetic superlattices and multilayers. The giant spin-orbit torque, low resistivity, and strong anomalous Nernst effect suggest the great potential of the superlattice [Pt<sub>0.75</sub>Cu<sub>0.25</sub>/Co/Ta]<sub><i>n</i></sub> for low-power memory and logic technologies as well as high-performance thermoelectric battery and sensor applications.