The permeability-frequency response of 4-79 molybdenum permalloy foils

Foils of 4-79 molybdenum Permalloy have been measured for permeability-frequency characteristics as a function of heat treatment and foil thickness for frequencies up to 30 MHz. The slope of the permeability-frequency curve was found to be -0.7 instead of the -0.5 expected from classical theory. The...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1971-09, Vol.7 (3), p.672-674
Main Authors: Thornley, R., Kehr, W.
Format: Article
Language:English
Subjects:
Annealing
Frequency measurement
Furnaces
Heat treatment
Lamination
Magnetic circuits
Permeability measurement
Rough surfaces
Surface roughness
Thickness measurement
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Summary:Foils of 4-79 molybdenum Permalloy have been measured for permeability-frequency characteristics as a function of heat treatment and foil thickness for frequencies up to 30 MHz. The slope of the permeability-frequency curve was found to be -0.7 instead of the -0.5 expected from classical theory. The low-frequency permeability of foils thinner than 0.5 mil decreases rapidly with decreasing thickness. This decrease may be connected with changes in texture, surface roughness, or grain size, all of which were observed.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.1971.1067049