Abstract
We study an artificial spin ice system consisting of two identical layers separated by a height offset h. For a small separation, the layers are shown to attract each other provided the whole system is in the ground state. Such an attraction comes about by means of a power-law force that we compare to van der Waals forces. When magnetic monopoles occur in one (or both) layers, the scenario becomes even more interesting, and these layers may also repel each other. By tuning parameters like h and monopole distance, switching between attraction and repulsion may be accomplished in a feasible way. Regarding its thermodynamics, the specific heat peak shifts to lower temperature as h increases.
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