Fig. 2

Moiré-like patterns forming by the superposition of static magnetic fields. a MD simulation of magnetic NPs moving into high-field regions produced by two arrays of parallel magnetic lines placed at θ = 30^o with respect to one another. See also Supplementary Movies 2 and 5. b Optical micrographs of nanoparticle/polymer films forming between two line patterns at different angles or rotation (from θ = 0^o to θ = 90^o). Scale bars in a and b are 100 μm and 500 μm, respectively