Abstract
We report a large enhancement of the spin-orbit-torque (SOT) efficiency achieved by inserting an ultrathin $\mathrm{Co}$ layer between a single-crystal $\mathrm{Pt}$ layer and an epitaxial ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$ layer. We attribute this to the strong interfacial orbital hybridization between $\mathrm{Pt}$ and $\mathrm{Co}$. Another effect of this hybridization is the spin-rotation effect based on the out-of-plane component of the magnetic moment, which explains the observation of out-of-plane torques. Our results offer an effective approach to engineer the SOT in a conventional ferromagnet-heavy metal system, which might provide opportunities for spintronic application.
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