Magnetic random anisotropy model approach on nanocrystalline Fe88Sm9Mo3 and Fe88Sm9Mo3C alloys

•The magnetic properties of Fe88Sm9Mo3 and Fe88Sm9Mo3C alloys have been investigated.•The results have been interpreted in the framework of random magnetic anisotropy model.•The model gives a good fit of the experimental M(H).•Some fundamental parameters have been extracted.•Carbon insertion leads to a decrease of KL and M.

The structure and magnetic properties of nanocrystalline Fe88Sm9Mo3 and Fe88Sm9Mo3C alloys have been investigated by means of X-ray diffraction coupled with magnetic measurements. We report here our study of approach to saturation magnetization. The results have been interpreted in the framework of random magnetic anisotropy model. From such analysis, some fundamental parameters have been extracted. We have determined the local magnetic anisotropy constant KL which are found to be 2.1 × 107 erg/cm3 for the nanocrystalline Fe88Sm9Mo3 alloy at 10 K. Carbon insertion leads to a decrease of the KL and magnetization.