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The driving field needed to release a domain wall from the specific notch geometry shown as a function of transverse field is plotted. The transverse field assists the depinning process when the field is in the direction of the magnetic moments in the domain wall (−y axis) and holds the domain wall more strongly when anti-aligned (+y axis).
The magnetic domain configuration of a 100 nm wide wire and the magnetic field applied to the wire as a function of time. The driving field is a constant 14 Oe applied along the +x axis and transverse pulses are applied. The transverse pulses are used to select which individual domain wall to move. The first pulse selects the domain wall on the left, and the second pulse selects the domain wall on the right.
(a) The Oersted field map for a current running through a 100 nm wide, 40 nm thick wire (solid black rectangle). The solid rectangles represent the locations of neighboring current carrying wires and the dashed rectangles are locations of the ferromagnetic separated from the current carrying wires by 10 nm of insulating material (b) The magnitude of the transverse magnetic field component at the locations of the ferromagnetic wires for a 3.5 mA current in the central wire.
(a)-(f) Time lapse sequence of the magnetic domain state for a three wire system. The central 3 μm length of each wire is shown. Each wire is 100 nm wide and separated from its neighbors by 100 nm. Schematics of the applied transverse field pulses (±150 Oe) and the direction of the global driving field (±14 Oe) represented by the large arrows shown on the left. The final magnetic domain states, after the application of the given fields in the step, from the previous state, are shown.
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