Spin–torque dynamics for noise reduction in vortex-based sensors

The performance of magnetoresistive sensors is today mainly limited by their 1/f low-frequency noise. Here, we study this noise component in vortex-based TMR sensors. We compare the level different magnetization configurations device, i.e., vortex state or uniform parallel antiparallel states. find that at least an order magnitude noisier than Nevertheless, activating spin-transfer-induced dynamics configuration, observe a reduction noise, close to values measured AP state, as core has lower probability pinning into defect sites. Additionally, driving non-resonant rf field current, demonstrate can be further decreased. ability reduce devices leveraging spin-transfer thus enhances applicability magnetic sensors' landscape.