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Demonstration of high-performance compact magnetic shields for chip-scale atomic devices
E A Donley1, E Hodby, L Hollberg
1Time and Frequency Division, National Institute of Standards and Technology, Boulder, CO 80305, USA.
The Review of Scientific Instruments
|September 4, 2007
Summary
We developed miniature nested magnetic shields offering significant magnetic field reduction. A three-shield set achieved a shielding factor of 6 x 10^6, with five shields predicted to reach 1 x 10^13.
Area of Science:
- Physics
- Materials Science
- Engineering
Background:
- Minimizing magnetic field interference is crucial for sensitive measurements.
- High-permeability materials are essential for effective magnetic shielding.
- Nested shield designs offer enhanced performance over single layers.
Purpose of the Study:
- To design and test miniature nested magnetic shields.
- To quantify the shielding factors of individual and combined shield layers.
- To validate shielding performance using multiple measurement techniques.
Main Methods:
- Constructed five nested magnetic shields using high-permeability material.
- Measured longitudinal and transverse shielding factors for up to three nested layers.
- Employed chip-scale atomic magnetometers and magnetoresistive sensors for internal field measurement.
Main Results:
- Individual shields and combinations up to three layers were tested.
- A shielding factor of 6 x 10^6 was achieved with three nested shields.
- Measurements using two distinct methods showed good agreement.
Conclusions:
- The miniature nested magnetic shields demonstrate high performance.
- A shielding factor up to 1 x 10^13 is predicted for five nested shields.
- The developed shields are suitable for applications requiring extreme magnetic field reduction.
