Field-induced domain wall propagation velocity in magnetic nanowires

Details Field-induced domain wall propagation velocity in magnetic nanowires Field-induced domain wall propagation velocity in magnetic nanowires

2009-03-03

arxiv.org/abs/0903.0431v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

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.

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