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J-mixing effects on the anisotropy of Sm2Co17

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4 Author(s)

Measurements of the temperature dependence of the anisotropy field HA for Sm2Co17, Er2Co17 , and Y2Co17 are reported. Two distinct values mere detected for the samarium compound at low temperature, as a result of the occurrence of in-plane magnetocrystalline anisotropy. From this data it was possible to derive the value of the sixth order anisotropy constant K3'. However the crystal field model predicts zero value for the sixth-order anisotropy term if only the ground multiplet of the Sm3+ ion is considered. This contradiction between theory and experiment was removed by taking into account the mixing of the lowest spin-orbit multiplets of Sm3+ due to the exchange interaction. In this frame it was shown that a linear proportionality relation between K3' and the sixth-order crystal field parameter B66 is valid. This made possible a direct evaluation of B66 from the experimental data. The influence of J mixing on the second-order anisotropy constant K1 for Sm2Co17 and Er2Co17 was also investigated by analyzing the curve HA(T) in the temperature range T>200 K

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Magnetics, IEEE Transactions on  (Volume:37 ,  Issue: 4 )