Microscopy from Scientific Research

Local generation of DWs in the Type-II segmented racetrack by alternating the external OOP field (top) and the number of injected current pulses (bottom). Top: each line is taken after injection of a single current pulse (10 ns,Jw/oPt= 2.47 × 108A cm−2) with an external OOP field of 30 Oe, directed either upward (⊙) or downward (⊗). A series of domains can be generated as marked by “1” and “0”. Bottom: magnetic domains are switched up and elongated by 1, 3, 5, 7 pulses of currents (10 ns,Jw/oPt= 2.47 × 108A cm−2) in the presence of an external field (30 Oe, down ⊗) and then moved out of the ignition region by a series of current pulses (10 ns,Jw/oPt= 1.75 × 108A cm−2) composed of ten pulses without any field. Before both of the experiments, the magnetic domains are set to point up (↑) with a large external field (H= 1000 Oe).

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