Magnetic stochastic oscillators: Noise-induced synchronization to under-threshold excitation and comprehensive compact model

This paper presents the design of superparamagnetic tunnel junctions that behave like stochastic oscillators, oscillating with non-constant period but well-defined average frequency. Exposure of these oscillators to spin transfer torque can influence their stability of states and therefore control the natural frequency. Hence, the phenomena of stochastic resonance and noise-induced synchronization of the stochastic oscillations to weak periodic excitations are investigated. This study employs a compact model, written in the Verilog-A language which can be used within standard integrated circuit design tools (Cadence platform), for the system design.