# Spurious Ferromagnetic Remanence Detected by Hybrid Magnetometer

## TL;DR

This paper demonstrates how a hybrid atomic magnetometer can detect and analyze spurious ferromagnetic remanence in polymeric sample containers using nuclear magnetic resonance in ultra-low fields.

## Contribution

It introduces a novel method combining NMR and atomic magnetometry to identify and interpret remanent magnetization components in materials.

## Key findings

- Detection of static and dynamic magnetic fields from the container
- Frequency shifts and decay rate variations linked to remanence
- Modeling of signal interactions based on geometry

## Abstract

Nuclear magnetic resonance detection in ultra low field regime enables the measurement of different components of a spurious remanence in the polymeric material constituting the sample container. A differential atomic magnetometer detects simultaneously the static field generated by the container and the time-dependent signal from the precessing nuclei. The nuclear precession responds with frequency shifts and decay rate variations to the container magnetization. Two components of the latter act independently on the atomic sensor and on the nuclear sample. A model of the measured signal allows a detailed interpretation, on the basis of the interaction geometry.