Energy-Efficient W100−xTax/ Co-Fe-B/MgO Spin Hall Nano-Oscillators

• DOI: 10.1103/physrevapplied.18.024017
• Publication Date: 2022-08-05T17:15:57Z
• Authors: Nilamani Behera; Himanshu Fulara; Lakhan Bainsla; Akash Kumar; Mohammad Zahedinejad; Afshin Houshang; Johan Åkerman
• Keywords: Oscillation (cell signaling)

We investigate a W-Ta alloying route to reduce the auto-oscillation threshold current densities and power consumption of nanoconstriction based spin Hall nano-oscillators. Using spin-torque ferromagnetic resonance measurements on microbars ${\mathrm{W}}_{100\ensuremath{-}x}{\mathrm{Ta}}_{x}$(5 nm)/$\mathrm{Co}$-$\mathrm{Fe}$-$\mathrm{B}$($t$)/$\mathrm{Mg}\mathrm{O}$ stacks with $t=1.4$, 1.8, 2.0 nm, we measure substantial improvement in both spin-orbit torque efficiency conductivity. demonstrate 34% reduction density, which translates into 64% as compared pure W-based Our work demonstrates promising aspects for energy-efficient operation emerging spintronic devices.