Driven nonlinear damping and mode coupling in a superconducting levitated magnet

Xiaodong Jiang; Mahdi Hosseini

doi:10.1103/PhysRevResearch.4.013132

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Driven nonlinear damping and mode coupling in a superconducting levitated magnet

Xiaodong Jiang, Mahdi Hosseini

DOI 10.1103/PhysRevResearch.4.013132 · Physical Review Research

T1

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Abstract

The magnetic flux pinning phenomenon enables high-Q trapping of a magnet above a superconductor. In practice, the trapped magnet can undergo nonlinear mode coupling and dissipation as its vibration can induce variations of the magnetic field and vortex displacement on the superconductor surface. Here we study nonlinear interactions between vibrational modes of a levitated magnetic mirror above a superconducting disk in vacuum conditions. We observe that by exciting one vibrational mode of the levitated mirror, the vibrational noise of another mode can be suppressed by more than 17 dB. We attribute this unique noise suppression mechanism to the mode coupling and nonlinear dissipation caused by the driven magnetic inhomogeneity of the levitated object. The results suggest that noise reduction of a vibrational mode is possible by driving another orthogonal mode.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBaCuO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	93	Pressure not reported	unknown