On the issue of choosing the measuring zones in a faraday balance when studying magnetic susceptibility of small samples

Abstract

By the example of polar pieces of spherical, conical and truncated conical shape, we substantiate and implement the approach to identifying a local, spatially limited, working zone (to position and examine magnetic susceptibility of ‘microsamples’) for the Faraday balance, viz. the zone with stable inhomogeneity of the field. It involves obligatory obtaining and analyzing coordinate characteristics of induction (intensity) in the interpolar area, at this, sinuous characteristics, i.e. the ones with an inflexion, should be give preference to out of the traditional nonlinear characteristics. Then, the well-linearized zone near the inflexion point (the corresponding derivative here demonstrates an extremum) most fully satisfies the requirement (to a working zone) for preserving the field inhomogeneity constancy. It is established that in comparison with the spherical polar pieces, the conical ones provide a working zone that is closer to the axial line, whereas the truncated conical polar pieces ensure the zone farther from their axial line.