Simulation on local flux creep in type-II superconductors

Using C programming language, we have simulated the flux creep process in n onideal type-II superconductors. Global and local magnetization curves are calculated and the logarithmic time dependence of local magnetic induction B under a constant external field is examined. The effects of nonuniform pi nning potential and self-organized criticality (SOC) model on the simulatio ns are discussed. The results show that the main feature of flux creep is t he relaxation effect. The form of hysteresis loops is dependent on the magn etic field sweep rate. SOC can account for the occurrence of fluctuation to a certain extent and nonuniform pinning potential can enhance the fluctuat ion.