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Nucleation of domain walls by current-driving a single domain wall, confinedto the junction area of two symmetrical strips, is investigated usingsystematic micromagnetic simulations. Secondary domain walls (equivalently,bits encoded in domains) are simultaneously nucleated and driven byalternatively applying current pulses between two terminals in the structure.Simulations show that nanosecond-duration current pulses nucleate and driveseries of robust up/down domains even under realistic conditions. These resultsdemonstrate a technique for sequentially nucleating and shifting domain wallswithout using attached external bit lines, fields or modifying theferromagnetic strip.

Geometrical design for pure current-driven domain wall nucleation and shifting