  Artificial magnetic honeycomb lattices are expected to exhibit a broad and
tunable range of novel magnetic phenomena that would be difficult to achieve in
natural materials, such as long-range spin ice, entropy-driven magnetic
charge-ordered state and spin-order due to the spin chirality. Eventually, the
spin correlation is expected to develop into a unique spin solid state density
ground state, manifested by the distribution of the pairs of vortex states of
opposite chirality. Here we report the creation of a new artificial permalloy
honeycomb lattice of ultra-small connecting bonds, with a typical size of
$\simeq$ 12 nm. Detail magnetic and neutron scattering measurements on the
newly fabricated honeycomb lattice demonstrate the evolution of magnetic
correlation as a function of temperature. At low enough temperature, neutron
scattering measurements and micromagnetic simulation suggest the development of
loop state of vortex configuration in this system.
