Dynamical depinning of chiral domain walls

Abstract

The domain wall depinning field represents the minimum magnetic field needed to move a domain wall, typically pinned by samples' disorder or patterned constrictions. Conventionally, such field is considered independent on the Gilbert damping since it is assumed to be the field at which the Zeeman energy equals the pinning energy barrier (both damping independent). Here, we analyse numerically the domain wall depinning field as function of the Gilbert damping in a system with perpendicular magnetic anisotropy and Dzyaloshinskii-Moriya interaction. Contrary to expectations, we find that the depinning field depends on the Gilbert damping and that it strongly decreases for small damping parameters. We explain this dependence with a simple one-dimensional model and we show that the reduction of the depinning field is related to the internal domain wall dynamics, proportional to the Dzyaloshinskii-Moriya interaction, and the finite size of the pinning barriers.

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Cited by in corpus (9)

• Pinning of Domain Walls in thin Ferromagnetic Films
• Barkhausen noise from precessional domain wall motion
• Ultrafast domain wall motion in ferrimagnets induced by magnetic anisotropy gradient
• Magnetic properties and field-driven dynamics of chiral domain walls in epitaxial Pt/Co/Au${}_x$Pt${}_{1-x}$ trilayers
• Ultrafast depinning of domain wall in notched antiferromagnetic nanostructures
• Rotating magnetic field driven antiferromagnetic domain wall motion: Role of Dzyaloshinskii-Moriya interaction
• Current-driven domain wall motion along ferromagnetic strips with periodically-modulated perpendicular anisotropy
• Domain Wall Motion in Magnetic Nanostrips
• Spin-reorientation critical dynamics in the two-dimensional XY model with a domain wall