  Magnetricity- the magnetic equivalent of electricity- was recently verified
experimentally for the first time. Indeed, just as the stream of electric
charges produces electric current, emergent magnetic monopoles have been
observed to roam freely (generating magnetic current) in geometrically
frustrated magnets known as spin ice. However, this is realized only by
considering extreme physical conditions as a single crystal of spin ice has to
be cooled to a temperature of $0.36 K$. Candidates to overcome this difficulty
are artificial analogues of spin ice crystals, the so-called artificial spin
ices. Here we show that, by tuning geometrical frustration down, a peculiar
type of these artificial systems is an excellent candidate. We produce this
material and experimentally observe the emergent monopoles; then, we calculate
the effects of external magnetic fields, illustrating how to generate
controlled magnetic currents. This potential nano-device for use in
magnetronics can be practical even at room temperature and the relevant
parameters (such as magnetic charge strength etc) for developing this
technology can be tuned at will.
