Bias-field-free spin Hall nano-oscillators with an out-of-plane precession mode

Abstract

Spin Hall nano-oscillators (SHNOs) are promising candidates for new microwave oscillators with high durability due to a small driving current. However, conventional SHNOs with an in-plane precession (IPP) mode require a bias field for stable oscillations which is not favored in certain applications such as neuromorphic computing. Here, we propose and theoretically analyze a bias-field-free SHNO with an in-plane hard axis and an out-of-plane precession (OPP) mode by solving the Landau-Lifshitz-Gilbert (LLG) equation analytically and numerically. We derive formulas for driving currents and precession frequency, and show that they are in good agreement with numerical simulation results. We show that our proposed SHNOs can be driven by much smaller bias current than conventional spin torque nano-oscillators.

References in corpus (2)

• Nonlinear analysis of magnetization dynamics excited by spin Hall effect
• Critical current density of a spin-torque oscillator with an in-plane magnetized free layer and an out-of-plane magnetized polarizer

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• Reconfigurable neural spiking in bias field-free spin Hall nano oscillator
• Out-of-plane magnetization oscillation in spin Hall device assisted by field-like torque