Field-induced domain wall propagation velocity in magnetic nanowires

Abstract

A thory of field-induced domain wall (DW) propagation is developed. The theory not only explains why a DW in a defect-free nanowire must propagate at a finite velocity, but also provides a proper definition of DW propagation velocity. This definition, valid for an arbitrary DW structure, allows one to compute the instantaneous DW velocity in a meaningful way even when the DW is not moving as a rigid body. A new velocity-field formula beyond the Walker breakdown field, which is in excellent agreement with both experiments and numerical simulations, is derived.

References in corpus (3)

• Dynamics of domain walls in magnetic nanostrips
• 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

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