Tunable backaction of a dc SQUID on an integrated micromechanical resonator

TL;DR

This paper demonstrates how a dc SQUID can be used to tune and measure the backaction on a micromechanical resonator, revealing controllable interactions via magnetic flux and bias current.

Contribution

It introduces a method to tune the backaction of a dc SQUID on a micromechanical resonator using magnetic flux and bias current, supported by numerical modeling.

Findings

Backaction can be controlled via bias current and magnetic flux.

Resonator frequency and quality factor are tunable.

Numerical RCSJ model reproduces experimental results.

Abstract

We have measured the backaction of a dc superconducting quantum interference device (SQUID) position detector on an integrated 1 MHz flexural resonator. The frequency and quality factor of the micromechanical resonator can be tuned with bias current and applied magnetic flux. The backaction is caused by the Lorentz force due to the change in circulating current when the resonator displaces. The experimental features are reproduced by numerical calculations using the resistively and capacitively shunted junction (RCSJ) model.