  A toy model for ferroic orders through entropy. As the rod/spin concentration
(or the volume enclosing the ferroic rods) is variable by a tunable force
conjugate to the order parameter, the model exhibits hysteresis associated to
some discontinuous isotropic-nematic transitions explained essentially by
Onsager's hard-rod model. The uniaxial anisotropy and nonperiodicity by
construction is reminiscent of Stoner-Wohlfarth's single-domain magnet, and the
toy model may ultimately be seen as a minimalistic for hard ferroics with some
possible self-averaging disorders. Spin togglings shall be reliable due to the
clean two-well energy landscapes in the athermal transition theory.
