  Emerging new concepts, such as magnetic charge dynamics in two-dimensional
magnetic material, can provide novel mechanism for spin based electrical
transport at macroscopic length. In artificial spin ice of single domain
elements, magnetic charge's relaxation can create an efficient electrical
pathway for conduction by generating fluctuations in local magnetic field that
couple with conduction electrons spins. In a first demonstration, we show that
the electrical conductivity is propelled by more than an order of magnitude at
room temperature due to magnetic charge defects sub-picosecond relaxation in
artificial magnetic honeycomb lattice. The direct evidence to the proposed
electrical conduction mechanism in two-dimensional frustrated magnet points to
the untapped potential for spintronic applications in this system.
