Width dependent auto-oscillating properties of constriction based spin Hall nano-oscillators

Abstract

We study the current tunable microwave signal properties of nano-constriction based spin Hall nano-oscillators (SHNOs) in oblique magnetic fields as a function of the nano-constriction width, $w=$~50--140 nm. The threshold current is found to scale linearly with $w$, defining a constant threshold current density of $J_{th}=$ 1.7 $\times$ 10${}^8$ A/cm${}^2$. While the current dependence of the microwave frequency shows the same generic non-monotonic behavior for all $w⩾$ 80 nm, the quality of the generated microwave signal improves strongly with $w$, showing a linear $w$ dependence for both the total power and the linewidth. As a consequence, the peak power for a 140 nm nano-constriction is about an order of magnitude higher than that of a 80 nm nano-constriction. The smallest nano-constriction, $w=$ 50 nm, exhibits a different behavior with a higher power and a worse linewidth indicating a crossover into a qualitatively different narrow-constriction regime.

References in corpus (19)

• Spin Hall effect
• Spin Transfer Torques
• Magnetic oscillations driven by the spin Hall effect in 3-terminal magnetic tunnel junction devices
• Nanowire Spin Torque Oscillator Driven by Spin Orbit Torques
• Spectral Characteristics of the Microwave Emission by the Spin Hall Nano-Oscillator
• Generation linewidth of an auto-oscillator with a nonlinear frequency shift: Spin-torque nano-oscillator
• Magnetization oscillations and waves driven by pure spin currents
• Spin-Orbit-Torque Driven Propagating Spin Waves
• 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
• Bridging magnonics and spin-orbitronics
• Domain wall-based spin-Hall nano-oscillators
• Mapping out the spin-wave modes of constriction-based spin Hall nano-oscillators in weak in-plane fields
• Magnetic droplet solitons generated by pure spin currents
• Nanoconstriction spin-Hall oscillator with perpendicular magnetic anisotropy
• Combined frequency and time domain measurements on injection-locked, constriction-based spin Hall nano-oscillators
• Dynamical mode coupling and coherence in spin Hall nano-oscillator with perpendicular magnetic anisotropy
• Controllable excitation of quasi-linear and bullet modes in a spin-Hall nano-oscillator
• Micro-focused Brillouin light scattering study of the magnetization dynamics driven by Spin Hall effect in a transversely magnetized NiFe nanowire

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