Radial magnetometric demagnetizing factor of thin disks

The radial magnetometric demagnetizing factor N_mr of a disk is calculated from the corresponding axial factor N_ma as a function of the ratio of thickness to diameter t/d and the susceptibility of material χ by the formula N_ma(t/d, χ= χ*) +2N_mr[t/d, χ=-χ*/(l +χ*)] =1+δ(t/d, χ*). This formula is derived from the magnetostatic laws with a correction (|δ|≪1) based on known values of N_ma and N_mr for χ*=∞. The accuracy of the N_mr thus obtained is estimated to be better than 1%, which satisfies most practical needs