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- W3129281399 abstract "Spin backflow and spin-memory loss have been well established to considerably lower the interfacial spin transmissivity of metallic magnetic interfaces and thus the energy efficiency of spin-orbit torque technologies. Here, we report that spin backflow and spin-memory loss at Pt-based heavy metal--ferromagnet interfaces can be effectively eliminated by inserting an insulating paramagnetic NiO layer of optimum thickness. The latter enables the thermal magnon-mediated essentially unity spin-current transmission at room temperature due to considerably enhanced effective spin-mixing conductance of the interface. As a result, we obtain dampinglike spin-orbit torque efficiency per unit current density of up to 0.8 as detected by the standard technology ferromagnet FeCoB and others, which reaches the expected upper-limit spin Hall ratio of Pt. We establish that $mathrm{Pt}/mathrm{NiO}$ and $mathrm{Pt}text{ensuremath{-}}mathrm{Hf}/mathrm{NiO}$ are two energy-efficient, integration-friendly, and high-endurance spin-current generators that provide $>100$ times greater energy efficiency than sputter-deposited topological insulators BiSb and BiSe. Our finding will benefit spin-orbitronic research and advance spin-torque technologies." @default.
- W3129281399 created "2021-03-01" @default.
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- W3129281399 date "2021-03-12" @default.
- W3129281399 modified "2023-10-14" @default.
- W3129281399 title "Fully Spin-Transparent Magnetic Interfaces Enabled by the Insertion of a Thin Paramagnetic NiO Layer" @default.
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- W3129281399 doi "https://doi.org/10.1103/physrevlett.126.107204" @default.
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- W3129281399 hasPublicationYear "2021" @default.
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