Coulomb field of spin ice monopoles

A field trip through spin ice.
G. Sala, C. Castelnovo, R. Moessner, S. L. Sondhi, K. Kitagawa, M. Takigawa, R. Higashinaka, and Y. Maeno
ArXiv 1112.3363 (2011)

Monopolar field inside spin ice – Illustration of the magnetic
field of a monopole at the centres of the super-tetrahedra of the
pyrochlore lattice, visualised by unit vectors in the local field direction
(red-blue arrows).