Suppression of telegraph noise in a CPP spin valve by an oscillating spin torque: Numerical study

TL;DR

This paper demonstrates through numerical analysis that a non-linear magnetic system with a periodic current can exhibit stochastic resonance-like behavior in higher dimensions, enabling suppression of low-frequency noise in spin valve sensors.

Contribution

It reveals a novel noise suppression mechanism in spin valves via oscillating spin torque, extending stochastic resonance concepts to higher-dimensional magnetic systems.

Findings

Behavior similar to stochastic resonance observed below FMR frequency

Effective suppression of low-frequency noise in spin valve sensors

Numerical evidence of non-linear magnetic system response

Abstract

The phenomenon of stochastic resonance (SR) has been mainly studied in one-dimensional systems with additive noise. We show that in higher dimensional systems and in the presence of multiplicative noise, a non-linear magnetic system with a strongly periodic current can show behavior similar to that of SR but only for frequencies below the ferromagnetic resonance (FMR) frequency of the system. Such a phenomena can provide an effective way to suppress low frequency noise in spin valve magnetic sensors.