Anisotropy energies for Y2Fe14B and Nd2Fe14B

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Abstract
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.