Stable states of systems of bistable magnetostrictive wires against   applied field, applied stress and spatial geometry
  Long-range magnetostatic interaction between wires strongly depends on their spatial position. This interaction, combined with applied tensile stress, influences the hysteresis loop of the system of wires through the stress dependence of their coercive fields. As a result, we obtain a set of stable magnetic states of the system, dependent on the applied field, applied stress and mutual positions of the wires. These states can be used to encode the system history. 
P. Gawronski, A. Chizhik, J. M. Blanco and K. Kulakowski