Anisotropy energies for Y₂Fe₁₄B and Nd₂Fe₁₄B

The approximate d bands for Y₂Fe₁₄B and Nd₂Fe₁₄B are formulated by Deegan’s prescription and the formulas of Slater and Koster. The electronic energies of these crystals with the spin directions [001], [100], [101], and [110] are calculated by Gilat and Raubenheimer’s method. The experimental result of the anisotropy energy for Y₂Fe₁₄B is analyzed with use of these calculated results by introducing the differences of the number of d electrons for these four states. In Nd₂Fe₁₄B the same differences of the number of d electrons are introduced and the contribution to the anisotropy energy due to 4f electrons is deduced. This contribution is analyzed by the use of the crystalline field potential (the localized model) and the band model with d‐f elements derived by Lendi. The obtained results are considered to be reasonable.