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Exceptional points in coupled vortex-based spin-torque oscillators
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DOI：10.1103/PhysRevB.108.174443.png)
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Abstract
En 中文
We theoretically study the linear and nonlinear dynamics of a system of mutually coupled magnetic vortices. We consider the excitation of vortex dynamics by both an external harmonic magnetic field and a spin-polarized current. The results based on the Thiele equations for the motion of coupled vortices are compared with the numerical integrations. Theoretical analysis shows that the appearance of the exceptional point corresponding to the coincidence of the normal modes of the system allows one to observe such effects as the death of amplitudes and parametric resonance. We propose a method for observing the effect of amplitude death in coupled magnetic vortices. In the investigated system, the emergence of exceptional points is controlled by the spin-polarized current and the strength of the coupling between vortices. Thus, possibilities are uncovered for the development of tunable spintronic devices.
Keywords:
MAGNETIC VORTEX
DYNAMICS
STABILITY
Journal
IF:
3.7
Papers:
15.4W
Citations:
41.0W