# Atomic-Scale Magnetometry of Dynamic Magnetization

## TL;DR

This paper introduces a novel atomic-scale magnetometry technique using NV centers in diamond, enabling highly precise measurements of magnetic responses in materials without external magnetic perturbations.

## Contribution

It proposes a reversed perturbation method where the probe's magnetic field induces a response in the sample, allowing for high-resolution magnetic imaging.

## Key findings

- Can measure magnetically dead layers with better than 0.1 Å accuracy
- Enables detection of paramagnetic and diamagnetic responses
- Improves spatial resolution of magnetic imaging

## Abstract

The spatial resolution of imaging magnetometers has benefited from scanning probe techniques. The requirement that the sample perturbs the scanning probe through a magnetic field external to its volume limits magnetometry to samples with pre-existing magnetization. We propose a magnetometer in which the perturbation is reversed: the probe's magnetic field generates a response of the sample, which acts back on the probe and changes its energy. For an NV$^-$ spin center in diamond this perturbation changes the fine-structure splitting of the spin ground state. Sensitive measurement techniques using coherent detection schemes then permit detection of the magnetic response of paramagnetic and diamagnetic materials. This technique can measure the thickness of magnetically dead layers with better than $0.1$ \AA$~$accuracy.