Demagnetizing factors for cylinders

摘要

Fluxmetric (ballistic) and magnetometric demagnetizing factors N/sub f/ and N/sub m/ for cylinders as functions of susceptibility chi and the ratio gamma of length to diameter have been evaluated. Using a one-dimensional model when gamma or= chi > infinity and N/sub m/ was calculated for chi to infinity . Using a two-dimensional model when 0.01>or= gamma >or=50, an important range for magnetometer measurements, N/sub m/ and N/sub f/ were calculated for -1>or= chi > infinity . Demagnetizing factors for chi >0 are applicable to superconductors. For chi =0, suitable for weakly magnetic or saturated ferromagnetic materials, N/sub f/ and N/sub m/ were computed exactly using inductance formulas.