Observation of ice-rule violation and monopole dynamics via edge nucleation of domain walls in artificial spin ice lattice
Lew, Wen Siang
Date of Issue2016
School of Physical and Mathematical Sciences
In a patterned Co honeycomb spin ice structure, we show that violation in the ice-rule or magnetic monopoles, can be observed during a magnetization reversal process in 430 Oe≤H≤760 Oe magnetic field (H) range. The monopoles are shown to originate from the nucleation of domain walls at the edges, and they hop towards the other edge via the propagation of magnetic domain walls. The paths that the domain walls traveled or the Dirac strings, are shown to increase in length with magnetic fields increment and no random flipping of the bars are observed in the structure.
Journal of Magnetism and Magnetic Materials
© 2016 Elsevier B.V.