Their trick was to shorten the lengths of the pulses of current to about a nanosecond.Rapidly changing currents exert a greater force on domain walls than do slowly changing ones.

• 他们的秘诀就在于将一阵阵电流的长度缩短到纳秒，因为与缓慢转变电流相比，快速地改变电流在域壁上产生的力度要来得更大。