The temperature dependence of the magnetic anisotropy constant K1 for SmCo5 and GdCo5 is well reproduced by calculations based on a single-ion model taking into account the anisotropies of the R-Co exchange interaction and the Co-sublattice magnetic moment. The anisotropy of the R-Co exchange interaction plays an important role in reproducing the experimental K1(T) for SmCo5 and GdCo5. It is found that the absolute value of the second order crystalline electric field parameter A2(0) in SmCo5 decreases monotonically with increasing temperature.
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