Loehr, JohannesOrtiz-Ambriz, AntonioTierno, Pietro2017-12-202017-12-202016-10-120031-9007https://hdl.handle.net/2445/118824We study the defect dynamics in a colloidal spin ice system realized by filling a square lattice of topographic double well islands with repulsively interacting magnetic colloids. We focus on the contraction of defects in the ground state, and contraction or expansion in a metastable biased state. Combining real-time experiments with simulations, we prove that these defects behave like emergent topological monopoles obeying a Coulomb law with an additional line tension. We further show how to realize a completely resettable 'nor' gate, which provides guidelines for fabrication of nanoscale logic devices based on the motion of topological magnetic monopoles.5 p.application/pdfeng(c) American Physical Society, 2016Col·loidesPolímersMatèria condensada tovaColloidsPolymersSoft condensed matterinfo:eu-repo/semantics/article6657432017-12-20info:eu-repo/semantics/openAccess27792372