Nanodiamond Sensing of Stray Fields during Domain Reversal
Abstract
Quantitative measurement of nanoscale stray magnetic fields during domain reversal is important for understanding and optimizing magnetic memory and logic devices. Yet, achieving high spatial resolution with minimally invasive probes remains challenging. Here we demonstrate nanodiamonds (NDs) hosting an ensemble nitrogen vacancy (NV) centers as local quantum sensors of domain-reversal stray fields in a CoFeB strip. During magnetic-field-driven reversal, the ND sensors resolve three distinct local responses depending on their positions relative to the strip: a positive frequency jump at the edge, an unexpected negative jump just outside the strip, and a negligible change near the center. These contrasting signals are quantitatively explained by magnetostatic boundary fields from micromagnetic simulations. We further implement a fully constrained fitting procedure for optically detected magnetic resonance spectra, enabling robust field extraction even when resonances are partially resolved. Together, these results establish NV-ND magnetometry as a simple, transferable, and quantitative approach for characterizing spatially heterogeneous magnetic fields in thin-films and spintronic devices.
Versions
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BibTeX
@misc{ho2026nanodiamond,
title = {{Nanodiamond Sensing of Stray Fields during Domain Reversal}},
author = {Kin On Ho and Hamza Abudayyeh and Andrew Perez and Hui-Ping Chang and Liang Juan Chang and Junwei Tong and Can Cui and Jean Anne C. Incorvia and Xiaoqin Li},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.31950},
eprint = {2609.31950},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.31950},
}
RIS
TY - UNPB
TI - Nanodiamond Sensing of Stray Fields during Domain Reversal
AU - Kin On Ho
AU - Hamza Abudayyeh
AU - Andrew Perez
AU - Hui-Ping Chang
AU - Liang Juan Chang
AU - Junwei Tong
AU - Can Cui
AU - Jean Anne C. Incorvia
AU - Xiaoqin Li
PY - 2026
DA - 2026/09/25
PB - arXiv
DO - 10.48550/arxiv.2609.31950
UR - https://arxiv.org/abs/2609.31950
AB - Quantitative measurement of nanoscale stray magnetic fields during domain reversal is important for understanding and optimizing magnetic memory and logic devices. Yet, achieving high spatial resolution with minimally invasive probes remains challenging. Here we demonstrate nanodiamonds (NDs) hosting an ensemble nitrogen vacancy (NV) centers as local quantum sensors of domain-reversal stray fields in a CoFeB strip. During magnetic-field-driven reversal, the ND sensors resolve three distinct local responses depending on their positions relative to the strip: a positive frequency jump at the edge, an unexpected negative jump just outside the strip, and a negligible change near the center. These contrasting signals are quantitatively explained by magnetostatic boundary fields from micromagnetic simulations. We further implement a fully constrained fitting procedure for optically detected magnetic resonance spectra, enabling robust field extraction even when resonances are partially resolved. Together, these results establish NV-ND magnetometry as a simple, transferable, and quantitative approach for characterizing spatially heterogeneous magnetic fields in thin-films and spintronic devices.
ER -