Fig. 4: Simulation results of skyrmion helicity reversal. | Nature Communications

Fig. 4: Simulation results of skyrmion helicity reversal.

From: Topological transformation of synthetic ferromagnetic skyrmions: thermal assisted switching of helicity by spin-orbit torque

Fig. 4

a The relationship between the skyrmion helicity of the top and bottom layers and the strength of DMI. b The critical DMI as a function of driving current density. c Total energy of the system and the topological number of the skyrmion over simulation time for D = 0.77 and 0.78 mJ/m2, respectively. d Trajectory of the skyrmion and the corresponding spin structure when a current density of 3.6 × 1011 A/m2 is applied for a duration of 63 ns. The DMI was initially 0.78 mJ/m2 for the first 40 ns and then decreased to 0.77 mJ/m2 for the remaining 23 ns. e Evolution of the spin texture during the helicity flipping process. The skyrmion helicity flip to +0.54π from −0.54π.

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