Spin Chirality in a Molecular Dysprosium Triangle: the Archetype of the   Non-Collinear Ising Model
  Single crystal magnetic studies combined with a theoretical analysis show that cancellation of the magnetic moments in the trinuclear Dy3+ cluster [Dy3(OH)2L3Cl(H2O)5]Cl3, resulting in a non-magnetic ground doublet, originates from the non-collinearity of the single ion easy axes of magnetization of the Dy3+ ions that lie in the plane of the triangle at 120 (deg.) one from each other. This gives rise to a peculiar chiral nature of the ground non-magnetic doublet and to slow relaxation of the magnetization with abrupt accelerations at the crossings of the discrete energy levels. 
Javier Luzon, Kevin Bernot, Ian J. Hewitt, Christopher E. Anson, Annie   K. Powell, and Roberta Sessoli