FARADAY MAGNETOMETER WITH SHERIC POLE PIECES: IDENTIFICATION ZONE WITH A STABLE FORCE FACTOR

Abstract

Basic principles and approaches in generation of devices for realization Faraday method are evaluated (for learning magnetic susceptibility of samples). It is noticed that problem exists - it is difficult to identify an operating area to coordinate here samples with a small volume. It was defined a prerequisites for an appearance area with a stable value of magnetic field intensity (induction) gradient of magnetic field. Presence such zone is a necessary but not sufficient condition for presence a zone with a stable value of magnetic forceful factor (as a product of field intensity or pole induction by its gradient). It was shown that developing direction in creating a Faraday magnetometer with a strong permanent magnet which pole surface is faced to sample is impractical because there is no prerequisites for an appearance stable zone both gradient and magnetic forceful factor. A creating Faraday magnetometer with mutually canted coils is hardly practical too. These coils generate magnetic field with a stable gradient but not with a stable magnetic forceful factor. By the example of spheric pole pieces (recommended for using at Faraday magnetometer) presence an areas with stable gradient and magnetic forceful factor is proved (at the range of their extremum values). Range of such areas is defined and compared to each other. It was shown that absciss values of extremum are almost stable (for each distance between pole pieces, regardless of current load), magnetic forceful factor's extremum are close to axis of magnet pole for about 30-40% than gradient's extremum. There were defined the influence of distance between pole pieces on absciss values of extremums of gradient and magnetic forceful factor (a logarithmic dependence) and on their ordinate values (power dependence).

Keywords

• faraday magnetometer
• induction
• gradient
• magnetic forceful factor
• range of extremum values