Abstract
Controlled domain wall motion and pinning in nanowires with perpendicular magnetic anisotropy are of great importance in modern magnetic memory and logic devices. Here, we investigate by experiment the DW pinning and depinning from a notch in a magnetic nanowire, under the influence of combined in- and out-of-plane magnetic fields. In our experiment, the perpendicular magnetization of the Co/Pt nanowires is tilted with the help of sub-μs in-plane field pulses generated by an on-chip coil. Consequently, the energy density of the DW is decreased and the depinning field of the notch is reduced. A theoretical model is applied and compared to the measurement results. The DW depinning mechanism and the DW type are further investigated by micromagnetic simulations.
Highlights
Domain wall (DW) motion and pinning in nanowires with perpendicular magnetic anisotropy (PMA) are of great interest in generation magnetic memory and logic devices.[1,2,3] the use of DW motion and pinning in magnetic nanowires may accelerate a high storage and computing density and low energy consumption in perpendicular Nanomagnetic Logic systems
Controlled domain wall motion and pinning in nanowires with perpendicular magnetic anisotropy are of great importance in modern magnetic memory and logic devices
The in-plane magnetic field components generated by the current wire are determined with the Finite Element Method Magnetics (FEMM) software,[17] which deduces a linear relation between the pulsed current Iin−plane and Bin−plane
Summary
Domain wall (DW) motion and pinning in nanowires with perpendicular magnetic anisotropy (PMA) are of great interest in generation magnetic memory and logic devices.[1,2,3] the use of DW motion and pinning in magnetic nanowires may accelerate a high storage and computing density and low energy consumption in perpendicular Nanomagnetic Logic (pNML) systems. To depin a magnetic domain from the notch, an additional out-of-plane field, e.g. by surrounding magnets, has to be applied.[4,7] In this way the signal flow is controlled by additional fields that cause the depinning of the DW. Lowering this depinning field by the use of already applied fields within the logic system can be of great importance in future pNML systems.
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