In-Plane Magnetic Field Tolerance of a Dispersive Aluminum Nanobridge SQUID Magnetometer

TL;DR

This study evaluates the flux sensitivity of a dispersive aluminum nanobridge SQUID magnetometer under in-plane magnetic fields, demonstrating its robustness and potential for high-speed nanoscale magnetic measurements.

Contribution

It provides the first characterization of in-plane magnetic field tolerance for a dispersive aluminum nanobridge SQUID magnetometer, highlighting its stability up to 61 mT.

Findings

Flux noise of 17 nΦ₀/Hz^{1/2} at zero field

Flux noise increases less than threefold up to 61 mT

Potential for operation in higher fields with device modifications

Abstract

We characterize the flux sensitivity of a dispersive 3D aluminum nanobridge SQUID magnetometer as a function of applied in-plane magnetic field. In zero field, we observe an effective flux noise of 17 n$\Phi_0$/Hz$^{1/2}$ with 25 MHz of bandwidth. Flux noise increased by less than a factor of three with parallel magnetic fields up to 61 mT. Operation in higher fields may be possible by decreasing the dimensions of the shunt capacitor in the magnetometer circuit. These devices are thus well suited for observing high-speed dynamics in nanoscale magnets, even in the presence of moderate bias magnetic fields.