Cloak, anticloak, magnification and illusion in magnetostatics

We theoretically demonstrate how cloaks, anticloaks, magnifiers and illusion devices can be devised for the case of static magnetic fields. For some of these devices, we make use of the concept of negative permeability materials. Because these materials can be emulated in practice by sets of currents, our results may provide the recipe for the experimental realization of novel devices for controlling magnetic fields.