We demonstrate quantitative magnetic field mapping with nanoscale resolution, by applying a lock-in technique on the electron spin resonance frequency of a single nitrogen-vacancy defect placed at the apex of an atomic force microscope tip. In addition, we report an all-optical magnetic imaging technique which is sensitive to large off-axis magnetic fields, thus extending the operation range of diamond-based magnetometry. Both techniques are illustrated by using a magnetic hard disk as a test sample. Owing to the non-perturbing and quantitative nature of the magnetic probe, this work should open up numerous perspectives in nanomagnetism and spintronics.
@article{arxiv.1108.4438,
title = {Nanoscale magnetic field mapping with a single spin scanning probe magnetometer},
author = {L. Rondin and J. -P. Tetienne and P. Spinicelli and C. Dal Savio and K. Karrai and G. Dantelle and A. Thiaville and S. Rohart and J. -F. Roch and V. Jacques},
journal= {arXiv preprint arXiv:1108.4438},
year = {2015}
}