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We study the interplay of topological bottlenecks and energetic barriers toequilibration in a Coulomb spin liquid where a short-range energetic couplingbetween defects charged under an emergent gauge field supplements theirentropic long-range Coulomb interaction. This work is motivated by theprevalence of memory effects observed across a wide range of geometricallyfrustrated magnetic materials, possibly including the spontaneous Hall effectobserved in Pr2Ir2O7. Our model is canonical spin-ice model on the pyrochlorelattice, where farther-neighbour spin couplings give rise to a nearest-neighborinteraction between topological defects which can easily be chosen to beunnatural or not, i.e. attractive or repulsive between defects of equal gaugecharge. Among the novel features of this model are the following. Afterapplying a field quench, a rich dynamical approach to equilibrium emerges,dominated by multi-scale energy barriers responsible for long-livedmagnetization plateaux. These even allow for the metastability of a"fragmented" spin liquid, an elusive regime where partial order co-exists witha spin liquid. Perhaps most strikingly, the attraction produces clusters ofdefects whose stability is due to a combination of energetic barriers for theirbreak-up and proximity of opposite charges along with an entropic barriergenerated by the topological requirement of annihilating a defect only togetherwith an oppositely charged counterpart. These clusters may take the form of a"jellyfish" spin texture, comprising an arrangement of same-sign gauge-charges,centered on a hexagonal ring with branches of arbitrary length. The ringcarries a clockwise or counterclockwise circular flow of magnetisation. Thisemergent toroidal degrees of freedom provides a possibility for time reversalsymmetry breaking with possible relevance to the spontaneous Hall effectobserved in Pr2Ir2O7.

When opposites repel: from metastability to extended chiral spin textures in spin ice with short-range topological-defect interactions