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Demonstration of high-performance chip-scale magnetic shields



Elizabeth A. Donley, Eleanor Hodby, Leo W. Hollberg, John E. Kitching


We have designed and tested a set of five miniature nested magnetic shields constructed of high-permeability material, with volumes ranging from 0.01 to 2.5 cm^3. We present measurements of the longitudinal and transverse shielding factors (the ratio of external to internal magnetic field) of both individual shields and combinations of up to three layers. The largest shielding factor measured was 6 x 10^6 for a nested set of three shields, and from our results we predict a shielding factor of up to 1 x 10^13 when all five shields are used. Two different techniques were used to measure the internal field -- a chip-scale atomic magnetometer and a commercially available magnetorestrictive sensor. Measurements with the two methods were in good agreement. The relative strengths of each technique for this task -- measuring a small magnetic field in a restricted volume -- are analysed.
Review of Scientific Instruments


atomic magnetometry, chip-scale devices, magnetic shielding


Donley, E. , Hodby, E. , Hollberg, L. and Kitching, J. (2007), Demonstration of high-performance chip-scale magnetic shields, Review of Scientific Instruments, [online], (Accessed July 20, 2024)


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Created August 14, 2007, Updated February 17, 2017