Lm. Martinez et al., COMPARISON OF AC-SUSCEPTIBILITY AND DIFFERENTIAL DC-SUSCEPTIBILITY OFZN-BONDED SM2FE17N3, Journal of magnetism and magnetic materials, 144, 1995, pp. 993-994
The calculated differential dc-susceptibility due to coherent rotation
of magnetisation in Zn-bonded Sm2Fe17Nx magnets is compared with the
experimentally determined ac-susceptibility. From this, a critical fie
ld, H-cr, is derived as that where other demagnetizing processes becom
e important. The observed dependence of H-cr on temperature and Zn-con
tent show that H-cr is related to stray fields acting in the material.