Experimental study of magnetic quantum-dot cellular automata function arrays
磁性量子元胞自动机功能阵列的实验研究

Magnetic quantum-dot cellular automata(MQCA) function arrays are fabricated by electron beam lithography,thermal evaporation and lift-off technologies at room temperature.The effects of exposure dose and exposure time on MQCA function array patterns with three various spacings are experimentally investigated.The results show that the ideal pattern can only be obtained with 100 pA electron beam current and 0.38 lis exposure time.Magnetic force microscopy measurement on the fabricated inverter structure shows that the array demonstrates correct logic operation,which validates the feasibility of fabrication process for MQCA function arrays. Moreover,defect is observed in the experiments,simulations on the defective array show that missing nanomagnet defect in the array leads to signal inversion error.