Spatially resolved quantum magnetometry and stray-field reconstruction of permalloy microdisks using boron-vacancy centers in hexagonal boron nitride
Abstract
Transferable hexagonal boron nitride (hBN) hosting negatively charged boron-vacancy (VB−) spin defects offers a versatile platform for integrated quantum magnetometry, yet quantitative imaging of magnetic microstructures remains challenging. Here, we integrate a transferred hBN flake with a 4 μm-diameter permalloy (Py = Ni81Fe19) microdisk and perform spatially resolved optically detected magnetic resonance measurements at room temperature. An applied in-plane magnetic field distorts the vortex-state magnetization, generating edge-localized magnetic surface charges and pronounced stray-field signatures at opposite disk edges. By referencing each pixel to its local zero-field splitting and correcting for a residual out-of-plane bias field, we quantitatively reconstruct the out-of-plane stray-field distribution, revealing peak fields of approximately 11.2 mT. An edge-charge model reproduces the spatial distribution and amplitude of the reconstructed field, linking the ODMR response to the field-driven evolution of the vortex state. These results establish transferred hBN VB− sensors for quantitative magnetometry of magnetic microstructures.
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BibTeX
@misc{wen2026spatially,
title = {{Spatially resolved quantum magnetometry and stray-field reconstruction of permalloy microdisks using boron-vacancy centers in hexagonal boron nitride}},
author = {Peiting Wen and Shuyu Wen and Jiang Qu and Zeling Xiong and Katrin Schultheiss and Slawomir Prucnal and Artur Erbe and Kenji Watanabe and Takashi Taniguchi and Jürgen Lindner and Jürgen Fassbender and Manfred Helm and Shengqiang Zhou and Ruslan Salikhov and Helmut Schultheiss and Yonder Berencén},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.21630},
eprint = {2609.21630},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.21630},
}
RIS
TY - UNPB
TI - Spatially resolved quantum magnetometry and stray-field reconstruction of permalloy microdisks using boron-vacancy centers in hexagonal boron nitride
AU - Peiting Wen
AU - Shuyu Wen
AU - Jiang Qu
AU - Zeling Xiong
AU - Katrin Schultheiss
AU - Slawomir Prucnal
AU - Artur Erbe
AU - Kenji Watanabe
AU - Takashi Taniguchi
AU - Jürgen Lindner
AU - Jürgen Fassbender
AU - Manfred Helm
AU - Shengqiang Zhou
AU - Ruslan Salikhov
AU - Helmut Schultheiss
AU - Yonder Berencén
PY - 2026
DA - 2026/09/18
PB - arXiv
DO - 10.48550/arxiv.2609.21630
UR - https://arxiv.org/abs/2609.21630
AB - Transferable hexagonal boron nitride (hBN) hosting negatively charged boron-vacancy (VB^−) spin defects offers a versatile platform for integrated quantum magnetometry, yet quantitative imaging of magnetic microstructures remains challenging. Here, we integrate a transferred hBN flake with a 4 μm-diameter permalloy (Py = Ni81Fe19) microdisk and perform spatially resolved optically detected magnetic resonance measurements at room temperature. An applied in-plane magnetic field distorts the vortex-state magnetization, generating edge-localized magnetic surface charges and pronounced stray-field signatures at opposite disk edges. By referencing each pixel to its local zero-field splitting and correcting for a residual out-of-plane bias field, we quantitatively reconstruct the out-of-plane stray-field distribution, revealing peak fields of approximately 11.2 mT. An edge-charge model reproduces the spatial distribution and amplitude of the reconstructed field, linking the ODMR response to the field-driven evolution of the vortex state. These results establish transferred hBN VB^− sensors for quantitative magnetometry of magnetic microstructures.
ER -