Skyrmion Echo in a system of interacting Skyrmions

Abstract

We consider helical rotation of skyrmions confined in the potentials formed by nano-disks. Based on numerical and analytical calculations we propose the skyrmion echo phenomenon. The physical mechanism of the skyrmion echo formation is also proposed. Due to the distortion of the lattice, impurities, or pinning effect, confined skyrmions experience slightly different local fields, which leads to dephasing of the initial signal. The interaction between skyrmions also can contribute to the dephasing process. However, switching the magnetization direction in the nanodiscs (e.g. by spin transfer torque) also switches the helical rotation of the skyrmions from clockwise to anticlockwise (or vice-versa), and this restores the initial signal (which is the essence of skyrmion echo).

arXiv comment9 pages, 11 figures, accepted in Phys. Rev. Lett

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• Prethermal Floquet time crystals in chiral multiferroic chains and applications as quantum sensors of AC fields
• Steering skyrmions with microwave and THz electric pulses
• Topological charge and spin Hall effects due to skyrmions in canted antiferromagnets
• Topological transport of vorticity on curved magnetic membranes