Es. Gorkunov et al., DEMAGNETIZATION COEFFICIENTS FOR BODIES MADE OF POWDER FERROMAGNETIC MATERIALS, Russian journal of nondestructive testing, 33(9), 1997, pp. 605-608
A graphical method is given for calculating the demagnetization coeffi
cient of a porous ferromagnetic body. One can incorporate here the int
ernal demagnetization coefficient for the porous material.