Dynamics of magnetic charges in artificial spin ice

Details Dynamics of magnetic charges in artificial spin ice Dynamics of magnetic charges in artificial spin ice

2010-06-21

arxiv.org/abs/1006.4075v2

Physical Review Letters,105,187206, (2010)

Physics

Condensed Matter

Materials Science

Revised version in response to referee comments, references added

Scientific paper

10.1103/PhysRevLett.105.187206

Artificial spin ice has been recently implemented in two-dimensional arrays of mesoscopic magnetic wires. We propose a theoretical model of magnetization dynamics in artificial spin ice under the action of an applied magnetic field. Magnetization reversal is mediated by domain walls carrying two units of magnetic charge. They are emitted by lattice junctions when the the local field exceeds a critical value $H_c$ required to pull apart magnetic charges of opposite sign. Positive feedback from Coulomb interactions between magnetic charges induces avalanches in magnetization reversal.

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