Abstract
The evolution of the magnetic anisotropy of (Ce,Y) 2Co 17 compounds with increasing Ce concentration was investigated by magnetic measurements and X-ray diffraction on magnetically aligned powders. At room temperature the easy magnetization direction changes from perpendicular to the c-axis to parallel to the c-axis with increasing Ce concentration. A spin-reorientation transition from easy-axis anisotropy at higher temperatures to easy-plane anisotropy at lower temperatures arises at about 600, 530 and 320 K in Ce 1.3Y 0.7Co 17, Ce 1.5Y 0.5Co 17 and Ce 1.7Y 0.3Co 17, respectively. The Curie temperature and spontaneous magnetization decrease with increasing Ce concentration. These magnetic behaviours are discussed in terms of the itinerant 4f states of Ce ion and the hybridization between the cobalt 3d states and the cerium 4f states.
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