Tracking random walk of individual domain walls in cylindrical nanomagnets with resistance noise

Abstract

The stochasticity of domain wall (DW) motion in magnetic nanowires has been probed by measuring slow fluctuations, or noise, in electrical resistance at small magnetic fields. By controlled injection of DWs into isolated cylindrical nanowires of nickel, we have been able to track the motion of the DWs between the electrical leads by discrete steps in the resistance. Closer inspection of the time-dependence of noise reveals a diffusive random walk of the DWs with an universal kinetic exponent. Our experiments outline a method with which electrical resistance is able to detect the kinetic state of the DWs inside the nanowires, which can be useful in DW-based memory designs.

to be published in Phys. Rev. Lett

References in corpus (2)

• Criticality of tuning in athermal phase transitions
• Resistivity noise in crystalline magnetic nanowires and its implications to domain formation and kinetics

Cited by in corpus (11)

• Magnetic nanowires and nanotubes
• Spin and charge pumping by steady or pulse current-driven magnetic domain wall: A self-consistent multiscale time-dependent-quantum/time-dependent-classical approach
• Dzyaloshinskii-Moriya domain walls in magnetic nanotubes
• Domain-wall dynamics in translationally noninvariant nanowires: theory and applications
• Broadband spectroscopy of thermodynamic magnetization fluctuations through a ferromagnetic spin-reorientation transition
• Dynamical implications of sample shape for avalanches in 2-dimensional random-field Ising model with saw-tooth domain wall
• Electric signature of magnetic domain-wall dynamics
• Field-tunable stochasticity in the magnetization reversal of a cylindrical nanomagnet
• Electrically controlled pinning of Dzyaloshinskii-Moriya domain walls
• Intrinsic anomalous scaling in a ferromagnetic thin film model
• The critical Barkhausen avalanches in thin random-field ferromagnets with an open boundary