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It is pointed out that the energy decrease due to the magnetization of the spin is large in the ferromagnetic substances and that the energy decrease due to the formation of the antiferromagnetic disposition is large in the antiferromagnetic substances. The calculation is made for the energy decrease in the ferromagnetic state as a function of the number of d electrons. This calculation explains the paramagnetic Au4Ti, the weak ferromagnetic Au4V, and the ferromagnetic Au4Mn. The energy decrease for Au5 and Au3V2 is also calculated, and it is shown that ferromagnetism appears in the vicinity of Au4V. The calculation is made for the energy decrease in the antiferromagnetic state as a function of the number of d electrons. This calculation suggests that antiferromagnetism appears in Au4Cr. The anisotropy energies for Au4V and Au4Mn are calculated to be in agreement with the experimental result. It is shown that the magnetic moment in Au4Cr should be parallel to [001] direction. Finally, the magnetism of Au8...

The approximate d bands of antiferromagnetic α‐Mn are formulated, using Deegan’s prescription and the formulas of Slater and Koster, in consideration of the crystal and magnetic structures. The magnetic moments of 29 atoms are calculated by adopting reasonable coefficients of the effective exchange interaction. The obtained result is much the same as the experimental result.