Magnetic interactions in nanocrystalline SmFeCo

Abstract

Articles you may be interested inMicrostructure of multistage annealed nanocrystalline SmCo2Fe2B alloy with enhanced magnetic properties Several samples of enhanced-remanence nanocrystalline Sm 15 Fe 19 Co 66 were prepared by mechanical alloying of the elementary powders followed by heat treatments. Sample A had a remanence ratio ϭ r / s ϭ0.68 and H c ϭ7.1 kOe, while, for B, ϭ0.58 and H c ϭ10.4 kOe, and, for C, ϭ0.57 and H c ϭ12.6 kOe. The isothermal remanent magnetization M r (H), obtained for different initial demagnetized states ͑ac, dc ϩ , dc Ϫ ͒, and the demagnetization remanence M d (ϪH), obtained for an initially saturated state, were determined. The ac-demagnetization Henkel plot showed both magnetizing and demagnetizing interactions as observed in other nanocrystalline magnets. A comparison with the moving Preisach model indicates the importance of both mean-field and random interactions.