title: Technique for high axial shielding factor performance of large-scale, thin, open-ended, cylindrical Metglas magnetic shields.
abstract: Metglas 2705M is a low-cost commercially available, high-permeability cobalt-based magnetic alloy, provided as a 5.08-cm wide and 20.3-μm thick ribbon foil. We present an optimized construction technique for single-shell, large-scale (human-size), thin, open-ended cylindrical Metglas magnetic shields. The measured dc axial and transverse magnetic shielding factors of our 0.61-m diameter and 1.83-m long shields in the Earth's magnetic field were 267 and 1500, for material thicknesses of only 122 μm (i.e., 6 foil layers). The axial shielding performance of our single-shell Metglas magnetic shields, obtained without the use of magnetic shaking techniques, is comparable to the performance of significantly thicker, multiple-shell, open-ended Metglas magnetic shields in comparable-magnitude, low-frequency applied external fields reported previously in the literature.
authors.affiliation: Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA.
authors.forename: S
authors.initials: S
authors.lastname: Malkowski
authors.forename: R
authors.initials: R
authors.lastname: Adhikari
authors.forename: B
authors.initials: B
authors.lastname: Hona
authors.forename: C
authors.initials: C
authors.lastname: Mattie
authors.forename: D
authors.initials: D
authors.lastname: Woods
authors.forename: H
authors.initials: H
authors.lastname: Yan
authors.forename: B
authors.initials: B
authors.lastname: Plaster