High sensitivity magnetic field sensor via sandwich type PDMS resonator

TL;DR

This paper introduces a high-sensitivity magnetic field sensor using a sandwich PDMS resonator structure, achieving nanotesla-level detection and directional sensing capabilities due to its flexible material properties.

Contribution

The study presents a novel sandwich PDMS resonator design that enhances magnetic sensitivity and enables directional sensing in a compact, flexible sensor.

Findings

Redshift sensitivity of 1.08 nm/mT

Blueshift sensitivity of 1.12 nm/mT

Minimum detectable magnetic field of 0.96 nT/Hz^{1/2}

Abstract

The sandwich structure as the core layer of PDMS resonator is proposed for single-axis magnetic sensor with high sensitivity. The small Young's modulus of flexible material corresponds to larger variation, resulting in a highly sensitive magnetic response. The sandwich structure pre-set magnetic field provides directional sensing feature. The experimental results show that the redshift sensitivity of 1.08 nm/mT and the blueshift sensitivity of 1.12 nm/mT in the unshielded environment, which is attributed to slight variation in PDMS Young's modulus. At 1.4 kHz, a minimum detectable magnetic field of 0.96 nT Hz-1/2 is realized.