微弱磁場検出性能を向上させた低雑音磁気センサーを開発（Researchers Develop Low-Noise Magnetic Sensor with Enhanced Weak-Field Detection）

2026-07-28 合肥物質科学研究院（HFIPS）

Harnessing spin-texture dynamics in synthetic ferrimagnets for low-noise, high-sensitivity magnetic sensors (Image by WANG Kang)

＜関連情報＞

• https://english.hf.cas.cn/nr/rn/202607/t20260728_1179304.html
• https://journals.aps.org/prl/abstract/10.1103/vf43-sxwq

スピンテクスチャダイナミクスを活用した低ノイズ・高感度磁気センサー Harnessing Spin-Texture Dynamics for Low-Noise, High-Sensitivity Magnetic Sensors

Kang Wang, Teng Xu, Meng Shi, Xinxiang Sun, Yizhou Liu, Huali Yang, Run-Wei Li, and Haifeng Du
Physical Review Letters  Published: 17 July, 2026
DOI: https://doi.org/10.1103/vf43-sxwq

Abstract

The development of low-noise, high-sensitivity magnetic sensors is essential for applications such as automotive systems, biomedical imaging, and magnetic microscopy. However, sensor performance has long been impeded by a fundamental constraint that noise and sensitivity increase concomitantly, which imposes a performance limit. Here, we show that this limit can be overcome by engineering spin-texture dynamics. While maintaining high sensitivity, the sensor noise is demonstrated to decrease inversely with enhanced spin-texture dynamics. Leveraging this mechanism, using synthetic ferrimagnets with accelerated spin-texture dynamics, low-noise and high-sensitivity anomalous-Hall sensors are constructed. With an active sensing area of 2⁢0×2⁢0 μm2, the device demonstrates a field detectability of 1⁢5.7  nT/√Hz at 1 Hz, nearly an order of magnitude improvement over existing sensors based on ferromagnetic materials. Our results establish active control of spin textures as a general pathway to ultrasensitive, low-noise magnetic sensing platforms.