Energy-Efficient W100 −xTax/Co-Fe-B/MgO Spin Hall Nano-Oscillators
Abstract
We investigate a W-Ta alloying route to reduce the auto-oscillation threshold current densities and the power consumption of nanoconstriction based spin Hall nano-oscillators. Using spin-torque ferromagnetic resonance measurements on microbars of W100 −xTax(5 nm)/Co -Fe -B (t )/Mg O stacks with t =1.4 , 1.8, and 2.0 nm, we measure a substantial improvement in both the spin-orbit torque efficiency and the spin Hall conductivity. We demonstrate a 34% reduction in auto-oscillation threshold current density, which translates into a 64% reduction in power consumption as compared with pure W-based spin Hall nano-oscillators. Our work demonstrates the promising aspects of W-Ta alloying for the energy-efficient operation of emerging spintronic devices.
- Publication:
-
Physical Review Applied
- Pub Date:
- August 2022
- DOI:
- 10.1103/PhysRevApplied.18.024017
- arXiv:
- arXiv:2111.08627
- Bibcode:
- 2022PhRvP..18b4017B
- Keywords:
-
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Physics - Applied Physics
- E-Print:
- doi:10.1103/PhysRevApplied.18.024017