Emergent electromagnetism induced by topological defects created during magnetization reversal in nanowires

M. Charilaou, H. -B. Braun, J. F. Loeffler

Published 2017-11-09Version 1

We report that the irreversible magnetization switching process in ferromagnetic nanoparticles is governed by the formation and dynamics of topological point-defects in the form of hedgehog-antihedgehog pairs. After nucleation, these pairs rapidly separate with speeds exceeding domain wall velocities, and they generate an emergent electric field of solenoidal character and substantial magnitude.