Giant Relaxation Oscillations in a Very Strongly Hysteretic SQUID   ring-Tank Circuit System
  In this paper we show that the radio frequency (rf) dynamical characteristics of a very strongly hysteretic SQUID ring, coupled to an rf tank circuit resonator, display relaxation oscillations. We demonstrate that the the overall form of these characteristics, together with the relaxation oscillations, can be modelled accurately by solving the quasi-classical non-linear equations of motion for the system. We suggest that in these very strongly hysteretic regimes SQUID ring-resonator systems may find application in novel logic and memory devices. 
T. D. Clark, R. J. Prance, R. Whiteman, H. Prance, M. J. Everitt, A.   R. Bulsara and J. F. Ralph