Ultra-low threshold chaos in cavity magnomechanics

TL;DR

This paper demonstrates a method to induce chaos in cavity magnomechanics at ultra-low power levels using a two-tone microwave drive, significantly advancing control over nonlinear magnonic systems.

Contribution

The authors introduce a coherent two-tone microwave driving scheme that drastically reduces the chaos threshold power in cavity magnomechanics, enabling new applications and fundamental studies.

Findings

Chaos threshold reduced from watts to microwatts

Relative phase controls chaotic behavior

Potential for chaos-based information processing

Abstract

Cavity magnomechanics using mechanical degrees of freedom in ferromagnetic crystals provides a powerful platform for observing many interesting classical and quantum nonlinear phenomena in the emerging field of magnon spintronics. However, to date, the generation and control of chaotic motion in a cavity magnomechanical system remain an outstanding challenge due to the inherently weak nonlinear interaction of magnons. Here, we present an efficient mechanism for achieving magnomechanical chaos, in which the magnomechanical system is coherently driven by a two-tone microwave field consisting of a pump field and a probe field. Numerical simulations show that the relative phase of the two input fields plays an important role in controlling the appearance of chaotic motion and, more importantly, the threshold power of chaos is reduced by 6 orders of magnitude from watts to microwatts. In addition to providing insight into magnonics nonlinearity, cavity magnomechanical chaos will always be of interest because of its significance both in fundamental physics and potential applications ranging from ultra-low threshold chaotic motion to chaos-based secret information processing.