Anisotropy energy of Y₂Fe₁₄B, Y₂Co₁₄B, Y₂Fe_14−xCo_xB, and La₂Co₁₄B Available to Purchase

The anisotropy energies of Y₂Fe₁₄B, Y₂Co₁₄B, Y₂Fe_14−xCo_xB, and La₂Co₁₄B are discussed with reference to the band model. The energy bands exclusive and inclusive of the p bands in B are formulated in consideration of the spin‐orbit interaction and exchange splitting. The anisotropy constant K₁ is estimated through the difference between the calculated electronic energies with the magnetization parallel to [001] and [100]. In Y₂Fe₁₄B, the calculated K₁ is much the same as the experimental result, and in Y₂Co₁₄B, it agrees with the experimental result. In Y₂Fe_14−xCo_xB, the calculated K₁ inclusive of the p bands in B is much the same as the experimental result. Finally, the anisotropy energy of La₂Co₁₄B is discussed by taking into account the 4f bands just above the Fermi level.