Fast domain wall propagation under an optimal field pulse in magnetic nanowires

Abstract

We investigate field-driven domain wall (DW) propagation in magnetic nanowires in the framework of the Landau-Lifshitz-Gilbert equation. We propose a new strategy to speed up the DW motion in a uniaxial magnetic nanowire by using an optimal space-dependent field pulse synchronized with the DW propagation. Depending on the damping parameter, the DW velocity can be increased by about two orders of magnitude compared the standard case of a static uniform field. Moreover, under the optimal field pulse, the change in total magnetic energy in the nanowire is proportional to the DW velocity, implying that rapid energy release is essential for fast DW propagation.

4 pages, 3 figures; updated version replaced

References in corpus (3)

• Theoretical limit of the minimal magnetization switching field and the optimal field pulse for Stoner particles
• Euler equation of the optimal trajectory for the fastest magnetization reversal of nano-magnetic structures
• Analytical solution of the equation of motion for a rigid domain wall in a magnetic material with perpendicular anisotropy

Cited by in corpus (11)

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• General planar transverse domain walls realized by optimized transverse magnetic field pulses in magnetic biaxial nanowires
• Domain wall motion in ferromagnetic nanotubes: Analytic results
• Engineering planar transverse domain walls in biaxial magnetic nanostrips by tailoring transverse magnetic fields with uniform orientation
• Stability of precessing domain walls in ferromagnetic nanowires
• Current-induced domain wall motion with adiabatic spin torque only in cylindrical nanowires
• Optimal time-dependent polarized current pattern for fast domain wall propagation in nanowires: Exact solutions for biaxial and uniaxial anisotropies
• Survey of 360${}^{\circ }$ domain walls in magnetic heterostructures: topology, chirality and current-driven dynamics
• Geometric signature of reversal modes in ferromagnetic nanowires