Spin ice on a triangular lattice

Extending spin ice concepts to another geometry: The artificial triangular spin ice.
L. A. S. Mól, A. R. Pereira, and W. A. Moura-Melo
Phys. Rev. B 85, 184410 (2012)

The 64 possible vertices, grouped by increasing energy (left to right) in 8 topologies. Vertices type 1, 3, and 5 satisfy the three-in/three-out ice rule, while vertices type 2, 4, and 6 are single magnetic charges. Vertices type 7 and 8 are double and triple charged vertices, respectively.