St. Jiang et al., RESEARCH ON THE ORIGIN OF MAGNETOCRYSTALLINE ANISOTROPY IN R2FE14B COMPOUNDS, Journal of magnetism and magnetic materials, 136(3), 1994, pp. 294-300
A model for the calculation of the magneto-crystalline anisotropy in R
2Fe14B (R is a rare earth) compounds is presented. According to the mo
del, a combined effect on the R-ion, coming from both the crystal fiel
d of ligands and the electric field of itinerant electrons, results in
the anisotropy of the compounds. An approach of calculating the inter
action between the itinerant electrons and the central R-ion is given.
Taking account of the combined effect, we calculated the temperature
dependences of the anisotropy of all the five R2Fe14B-type (R = Pr, Nd
, Tb, Dy and Ho) compounds with uniaxial anisotropy. The results are i
n good agreement with the experiments. The calculation has shown that
the effect of the itinerant electrons plays an important role for the
anisotropy of the compounds.