Compositional effect on auto-oscillation behavior of Ni100-xFex/Pt spin Hall nano-oscillators

Abstract

We demonstrate the compositional effect on the magnetodynamic and auto-oscillations properties of Ni100-xFex/Pt (x= 10 to 40) nanoconstriction based spin Hall nano-oscillators. Using spin-torque ferromagnetic resonance (ST-FMR) performed on microstrips, we measure a significant reduction in both damping and spin Hall efficiency with increasing Fe content, which lowers the spin pumping contribution. The strong compositional effect on spin Hall efficiency is primarily attributed to the increased saturation magnetization in Fe-rich devices. As a direct consequence, higher current densities are required to drive spin-wave auto-oscillations at higher microwave frequencies in Fe-rich nano-constriction devices. Our results establish the critical role of the compositional effect in engineering the magnetodynamic and auto-oscillation properties of spin Hall devices for microwav eand magnonic applications.

References in corpus (17)

• Spin torque switching with the giant spin Hall effect of tantalum
• Spin Hall effect
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Role of transparency of platinum-ferromagnet interface in determining intrinsic magnitude of spin Hall effect
• Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations
• Antiferromagnonic Spin Transport from Y${}_3$Fe${}_5$O${}_{12}$ into NiO
• Enhancement of Perpendicular Magnetic Anisotropy and Transmission of Spin-Hall-Effect-Induced Spin Currents by a Hf Spacer Layer in W/Hf/CoFeB/MgO Layer
• Conduction of spin currents through insulating oxides
• Spin pumping damping and magnetic proximity effect in Pd and Pt spin-sink layers
• A unified first-principles study of Gilbert damping, spin-flip diffusion and resistivity in transition metal alloys
• Spin-Orbit-Torque Driven Propagating Spin Waves
• An Intrinsic Spin Orbit Torque Nano-Oscillator
• On the origin of magnetization auto-oscillations in constriction-based spin Hall nano-oscillators
• CMOS compatible W/CoFeB/MgO spin Hall nano-oscillators with wide frequency tunability
• Giant voltage control of spin Hall nano-oscillator damping
• Mapping out the spin-wave modes of constriction-based spin Hall nano-oscillators in weak in-plane fields
• Near-Unity Spin Hall Ratio in Ni${}_x$Cu${}_{1-x}$ Alloys

Cited by in corpus (3)

• Energy-efficient W${}_{\text{100-x}}$Ta${}_{\text{x}}$/CoFeB/MgO spin Hall nano-oscillators
• Spin wave excitations in a nanowire spin-torque oscillator with perpendicular magnetic anisotropy
• Energy-efficient spin Hall nano-oscillators using near-compensated CoGd ferrimagnets