Skyrmion Dynamics in a Double-Disk Geometry under an Electric Current
Autor
Castillo-Sepúlveda, Sebastián
Vélez, Javier A.
Corona, Rosa M.
Carvalho-Santos, Vagson L.
Laroze, David
Altbir, Dora
Resumen
In this work, we present an analysis of skyrmion dynamics considering Dzyaloshinskii–Moriya interactions in an STNO device with a double-disk geometry. Three regimes were observed as a function of geometric parameters and the electric current density: (i) the skyrmion is annihilating at the system’s border; (ii) the skyrmion moves in a non-circular trajectory alternating its position between the two disks, and (iii) the skyrmion only rotates inside a one-disk subsystem. For the annihilation state, we found that the transient time decays within a stretched exponential law as a function of the electric current. Our results show a 2D state diagram that can guide new experimental work in order to obtain these specific behaviors for new applications based on skyrmion dynamics. © 2022 by the authors.
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