Abstract
Controlling the domain wall (DW) trajectory in magnetic network structures is crucial for spin-based device related applications. The understanding of DW dynamics in network structures is also important for study of fundamental properties like observation of magnetic monopoles at room temperature in artificial spin ice lattice. The trajectory of DW in magnetic network structures has been shown to be chirality dependent. However, the DW chirality periodically oscillates as it propagates a distance longer than its fidelity length due to Walker breakdown phenomenon. This leads to a stochastic behavior in the DW propagation through the network structure. In this study, we show that the DW trajectory can be deterministically controlled in the magnetic network structures irrespective of its chirality by introducing a potential barrier. The DW propagation in the network structure is governed by the geometrically induced potential barrier and pinning strength against the propagation. This technique can be extended for controlling the trajectory of magnetic charge carriers in an artificial spin ice lattice.
Highlights
Controlling the domain wall (DW) trajectory in magnetic network structures is crucial for spin-based device related applications
Recent developments in domain wall (DW) dynamics in magnetic network structures have enabled the study of magnetic charge carrier hopping in artificial spin ice lattice[1,2,3,4,5]
It is shown that asymmetry provides a potential barrier to the DW and constrains it to move in a particular branch, making the output immune to the effect of Walker breakdown
Summary
Expected to propagate along the upper branch whereas an anticlockwise chirality (ACW) VDW moves along the lower branch[11,17]. This implies that the ACW VDW propagates along the upper branch. As the magnetic field was increased along the +x direction, HH-ACW DW was injected and driven to the upper branch at a field strength of 65 Oe as shown in Fig. 3b (ii) This results in the change of the contrast of the upper branch from bright to dark. Our results are independent of the initial or final chirality of the DW
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