Magnetic field driven dynamics in twisted bilayer artificial spin ice at superlattice angles

Geometrical designs of interacting nanomagnets have been studied extensively in the form two-dimensional arrays called artificial spin ice. These systems are usually designed to create geometrical frustration and interest for unusual often surprising phenomena that can emerge. Advanced lithographic element growth techniques enabled realization complex involve elements arranged three dimensions. Using numerical simulations employing dumbbell approximation, we examine possible magnetic behaviors bilayer ice, which individual layers rotated with respect one another. The goal is understand how magnetization dynamics affected by long-range dipolar coupling be modified varying layer separation alignment through rotation. We consider bilayers where both either square or pinwheel arrangements islands. Magnetic reversal processes discussed terms domain wall configurations Unusual ordering predicted special angles define lateral superlattices systems.