AC magnetometry of van der Waals magnets using ultrasensitive Graphene Hall sensors
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908647571849216 |
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| author | Park, Eugene Keum, Jihoon Baek, Ji-Hwan Kim, Hyuncheol Watanabe, Kenji Taniguchi, Takashi Lee, Gwan-Hyoung Park, Je-Geun |
| author_facet | Park, Eugene Keum, Jihoon Baek, Ji-Hwan Kim, Hyuncheol Watanabe, Kenji Taniguchi, Takashi Lee, Gwan-Hyoung Park, Je-Geun |
| contents | Probing the dynamical magnetic properties of two-dimensional (2D) materials requires sensitive techniques capable of detecting small magnetic fields from nanoscale samples. We demonstrate quantitative AC and DC magnetometry of a ferromagnetic Fe3-xGeTe2 nanoflakes using ultrasensitive graphene Hall sensors. These devices achieve record-low magnetic field detection noise at both cryogenic and room temperature, enabled by hBN encapsulation, low-resistance fluorographene contacts, and a novel fabrication process. We perform quantitative AC susceptibility measurements up to 1 kHz, resolving both real and imaginary components with nanotesla-scale sensitivity and milliradian phase accuracy, the first such measurement in a van der Waals magnet. Our results establish graphene Hall sensors as a powerful and broadly applicable platform for studying magnetic and superconducting phases near the 2D limit. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_08962 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | AC magnetometry of van der Waals magnets using ultrasensitive Graphene Hall sensors Park, Eugene Keum, Jihoon Baek, Ji-Hwan Kim, Hyuncheol Watanabe, Kenji Taniguchi, Takashi Lee, Gwan-Hyoung Park, Je-Geun Materials Science Mesoscale and Nanoscale Physics Probing the dynamical magnetic properties of two-dimensional (2D) materials requires sensitive techniques capable of detecting small magnetic fields from nanoscale samples. We demonstrate quantitative AC and DC magnetometry of a ferromagnetic Fe3-xGeTe2 nanoflakes using ultrasensitive graphene Hall sensors. These devices achieve record-low magnetic field detection noise at both cryogenic and room temperature, enabled by hBN encapsulation, low-resistance fluorographene contacts, and a novel fabrication process. We perform quantitative AC susceptibility measurements up to 1 kHz, resolving both real and imaginary components with nanotesla-scale sensitivity and milliradian phase accuracy, the first such measurement in a van der Waals magnet. Our results establish graphene Hall sensors as a powerful and broadly applicable platform for studying magnetic and superconducting phases near the 2D limit. |
| title | AC magnetometry of van der Waals magnets using ultrasensitive Graphene Hall sensors |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2511.08962 |