Skyrmion-based chaotic oscillator driven by a constant current

As an intriguing and useful nonlinear behavior, chaos has recently received increasing attentions in the field of spintronics with the aim of designing novel devices for practical applications. In the present work, we demonstrate a chaotic oscillation of a ferrimagnetic skyrmion through numerical simulations. In contrast to the previous proposals of magnetic-soliton-based chaotic oscillators, the chaos of our ferrimagnetic skyrmion is driven solely by a constant current, instead of a time-dependent one. The occurrence of the chaotic oscillation is found to benefit from the strong nonlinearity of the magnetization dynamics in a ferrimagnet with a relatively weak antiferromagnetic exchange coupling and a low magnetic damping. Our results reveal the potentials of ferrimagnetic skyrmion oscillators in studying chaotic physics and related applications.