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Measuring the static and kinetic pinning fields at a T-shaped trap. (a) Equilibrium pinned configurations for a head-to-head DW at a T-shaped trap. The T-shape acts as a potential well when the magnetization in the core of the DW is parallel to the magnetization in the transverse arm and as a potential barrier when the magnetization is antiparallel. (b) The SEM image of an L-shaped nanostructure with a trap. The position of the MOKE laser spot is indicated by the dashed ellipse. (c) Schematic of kinetic depinning measurement, showing magnetization configurations and applied fields. The thicker, gray arrows indicate the fields applied using the electromagnet and the thinner, black arrows indicate the fast field pulse applied via the stripline. (d) Schematic of static depinning measurement.
Static and kinetic depinning fields at a T-shaped trap. The plots show the switching fraction as a function of field, measured on two nominally identical structures. The quoted field is the total field applied during the pulse, i.e., the sum of the fields applied via the stripline and via the electromagnet. Filled circles: measured when the DW is initially pinned at the corner, corresponding to kinetic depinning of the DW as it passes through the T-shaped trap. Open circles: measured when the DW is initially pinned at the trap, corresponding to static depinning of the DW from the trap. The dashed ellipses indicate the position of the MOKE laser spot.
Micromagnetic simulations. (a) Typical simulated position-time plot for a moving DW, with gray lines indicating the ten trap positions. (b) Probability of each final DW state—blocked AP, pinned P, or transmitted—as a function of field. The solid lines are guides to the eyes. The dashed line indicates the simulated static depinning field for a DW pinned in the parallel configuration. (c) Snapshots of the simulated DW interaction for one of the trap positions. The interaction with the T-shape causes the DW to become pinned in the parallel configuration. The applied field is 60 Oe. The grayscale indicates the -component of the magnetization, where the scale runs from white to black .
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