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Method for Determining Magnetic Moments and for Measuring Susceptibilities and Permeabilities

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1 Author(s)
Barnett, S.J. ; California Institute of Technology, PasadenaUniversity of California, Los Angeles, California

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Fundamentally, the method is closely related to one described by W. Weber in 1852 in his Elketrodynamische Maasbestimmungen and applied by him to the measurement of very small susceptibilities in cases in which it was desirable to exclude eddy currents from the specimens under examination. It is capable of being modified so as to measure magnetic moments and magnetic susceptibilities, large and small, under a great variety of conditions. The method has the advantage, for low permeabilities, over that of permeameters, that it measures precisely the (small) difference between the permeability of the specimen and that of air, and not the ratio of the two. It determines the magnetic moment of the specimen and the susceptibility k, from which the permeability μ may be derived from the relation μ=1+4πk.

Published in:

Journal of Applied Physics  (Volume:23 ,  Issue: 9 )

Date of Publication:

Sep 1952

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