Millikelvin magnetometry up to 30~T using a multi-cross micro-Hall sensor
Abstract
We report a multi-cross micro-Hall sensor fabricated from an MBE-grown GaAs/AlGaAs heterostructure for high-sensitivity magnetometry. The device enables dc magnetization measurements at temperatures down to ∼15~mK and in dc magnetic fields up to 30 T. Bulk samples with dimensions ranging from 100~μm to 1~mm can be measured with a resolution better than 1μT with a 1~μA excitation at 13.77 Hz. Test-of-performance measurements were carried out by probing the field-dependent magnetization plateaus of the triangular-lattice quantum magnet K2Co2(SeO3)3 at 20~mK, the antiferromagnetic transition of K3GdTe2O9 near 220 mK via temperature-dependent magnetization, and the quantum oscillations in a ruthenium single crystal. A simple and reliable sample-mounting setup that ensures reproducible magnetic measurements is provided.
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BibTeX
@misc{tong2026millikelvin,
title = {{Millikelvin magnetometry up to 30~T using a multi-cross micro-Hall sensor}},
author = {Bingbing Tong and Yinina Ma and Zhenhua Zhao and Shuyu Zheng and Li Lu and Peijie Sun and Gang Li},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.06676},
eprint = {2611.06676},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.06676},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Millikelvin magnetometry up to 30~T using a multi-cross micro-Hall sensor
AU - Bingbing Tong
AU - Yinina Ma
AU - Zhenhua Zhao
AU - Shuyu Zheng
AU - Li Lu
AU - Peijie Sun
AU - Gang Li
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2611.06676
UR - https://arxiv.org/abs/2611.06676
AB - We report a multi-cross micro-Hall sensor fabricated from an MBE-grown GaAs/AlGaAs heterostructure for high-sensitivity magnetometry. The device enables dc magnetization measurements at temperatures down to ∼15~mK and in dc magnetic fields up to 30 T. Bulk samples with dimensions ranging from 100~μm to 1~mm can be measured with a resolution better than 1μT with a 1~μA excitation at 13.77 Hz. Test-of-performance measurements were carried out by probing the field-dependent magnetization plateaus of the triangular-lattice quantum magnet K_2Co_2(SeO_3)_3 at 20~mK, the antiferromagnetic transition of K_3GdTe_2O_9 near 220 mK via temperature-dependent magnetization, and the quantum oscillations in a ruthenium single crystal. A simple and reliable sample-mounting setup that ensures reproducible magnetic measurements is provided.
ER -