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