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Fe-Based Nanocrystalline Magnetic Shielding Cylinder with Subfemtotesla-Level Magnetic Noise
Peipei Shen1, Danyue Ma1,2,3, Kun Wang1
1Hangzhou Institute of Extremely-Weak Magnetic Field Major National Science and Technology Infrastructure, Hangzhou, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 27, 2026
Summary
We developed a novel magnetic shielding system using Fe-based nanocrystals to reduce magnetic noise for sensitive atomic magnetometers. This Fe-Nano system achieves ultra-low magnetic noise, improving precision measurements.
Area of Science:
- Physics
- Materials Science
- Engineering
Background:
- Precision measurements using spin-exchange relaxation-free atomic magnetometers require advanced magnetic shielding.
- Conventional magnetic shielding systems (CMSS) using µ-metal often suffer from high magnetic noise, limiting performance.
Purpose of the Study:
- To develop a magnetic shielding system with high efficiency and low magnetic noise for atomic magnetometers.
- To overcome the limitations of conventional magnetic shielding systems.
Main Methods:
- Utilized Fe-based nanocrystalline (Fe-Nano) magnetic shielding cylinders (MSC) as the innermost shield in a CMSS.
- Prepared Fe-Nanos via melt-spinning and a three-step annealing process, characterizing their soft magnetic properties (permeability, loss factor).
Main Results:
- Fe-Nanos exhibited high permeability (64,000) and a low loss factor (2.4 × 10-7), indicating superior soft magnetic properties and lower intrinsic noise compared to µ-metal.
- The Fe-Nano MSC significantly suppressed magnetic noise, with a ten-layer configuration achieving an average magnetic noise of 0.84 fT Hz-1/2 (20-100 Hz).
Conclusions:
- The proposed Fe-Nano magnetic shielding strategy offers a lightweight, processable, and cost-effective solution for ultra-low magnetic noise.
- This advancement is expected to promote large-scale applications in biomagnetism and fundamental physics.
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