Energy-efficient W${}_{\text{100-x}}$Ta${}_{\text{x}}$/CoFeB/MgO spin Hall nano-oscillators

Abstract

We investigate a W-Ta alloying route to reduce the auto-oscillation current densities and the power consumption of nano-constriction based spin Hall nano oscillators. Using spin-torque ferromagnetic resonance (ST-FMR) measurements on microbars of W${}_{\text{100-x}}$Ta${}_{\text{x}}$(5 nm)/CoFeB(t)/MgO 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 threshold auto-oscillation current density, which translates into a 64\% reduction in power consumption as compared to pure W-based SHNOs. Our work demonstrates the promising aspects of W-Ta alloying for the energy-efficient operation of emerging spintronic devices.

References in corpus (5)

• Enhancement of the Anti-Damping Spin Torque Efficacy of Platinum by Interface Modification
• Giant Enhancement of Intrinsic Spin Hall Conductivity in $\beta$ Tungsten via Substitutional Doping
• Spin-orbit-torque magnonics
• Microwave power generated by a spin-torque oscillator in the presence of noise
• Compositional effect on auto-oscillation behavior of Ni100-xFex/Pt spin Hall nano-oscillators

Cited by in corpus (9)

• Robust mutual synchronization in long spin Hall nano-oscillator chains
• Spin wave-driven variable-phase mutual synchronization in spin Hall nano-oscillators
• Interfacial origin of unconventional spin-orbit torque in Py/$\gamma -$IrMn${}_3$
• Magnetic Proximity induced efficient charge-to-spin conversion in large area PtSe${}_2$/Ni${}_{80}$Fe${}_{20}$ heterostructures
• Power efficient ReLU design for neuromorphic computing using spin Hall effect
• Phase noise analysis of mutually synchronized spin Hall nano-oscillators
• Large Non-Volatile Frequency Tuning of Spin Hall Nano-Oscillators using Circular Memristive Nano-Gates
• Mutual synchronization in spin torque and spin Hall nano-oscillators
• Energy-efficient spin Hall nano-oscillators using near-compensated CoGd ferrimagnets