The magnetic moment of dysprosium has been measured in applied fields of 4000-18 000 oersteds, over the temperature range of 4.2-202^∘{}K. The susceptibility of dysprosium was found to be field dependent below about 175^∘{}K. Below 90^∘{}K, dysprosium appeared to have true though abnormal ferromagnetic properties, confirming the previous work of Trombe. At hydrogen and helium temperatures the magnetization isotherms fell below the 31^∘{}K isotherm. An absolute saturation magnetic moment of at least 8 Bohr magnetons was indicated by the data obtained in the temperature range of 31^∘{}K to 80^∘{}K. The magnitude of the measured values of the magnetic moment of dysprosium indicated that the orbital angular momentum of the $4f$ electrons contributes to the ferromagnetism.
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Elliott et al. (1954) studied this question.