Abstract
The structure and magnetic properties of nanocrystalline PrCo3 obtained from high energy milling technique are investigated by X-ray diffraction, Curie temperature determination and magnetic properties measurements are reported. The as-milled samples have been annealed in a temperature range of 1023 K to 1273 K for 30 mn to optimize the extrinsic properties. The Curie temperature is 349 K and coercive fields of 55 kOe at 10K and 12 kOe at 293 K are obtained on the samples annealed at 1023 K. A simulation of the magnetic properties in the framework of micromagnetism has been performed in order to investigate the influence of the nanoscale structure. A composite model with hard crystallites embedded in an amorphous matrix, corresponding to the as-milled material, leads to satisfying agreement with the experimental magnetization curve. [K. Younsi, V. Russier and L. Bessais, J. Appl. Phys. 107, 083916 (2010)]. The microscopic scale will also be considered from DFT based calculations of the electronic structure of RCox compounds, where R = (Y, Pr) and x = 2,3 and 5.
Published Version
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