Figure 2

Reversible conversion between skyrmion-DW pair and coherent skyrmion generation. (a) A skyrmion is created in the left chamber of the nanotrack. Then, it is drifted by current to the central chamber without the anti-notch, by transforming into a DW pair. Finally, it is, again, converted to the skyrmion by the passage in the entrance of right chamber. A current density of 7 TAm⁻² is applied along −x for 3 ns. However, the spatial magnetization is represented as frames for 0 ns < t < 0.8 ns to show the conversion process in more detail. (b) The coherent skyrmion generation after introducing the central chamber to the anti-notch with the dimensions of w = 20 nm, l = 30 nm. The current density is again 7 TAm⁻². Selected frames of the skyrmion generation process is represented from t = 0 ns to t = 1.08 ns. (c) x, y and z components of the total magnetization in the detector area (output magnetization) with respect to simulation time in the absence of anti-notch. (d) The output magnetization with respect to simulation time in the presence of anti-notch. (e) Skyrmion generator with the detector. The detector has the width of 30 nm and length (height) of 100 nm and its center is located at 85 nm far from the end of the right chamber.