Improving Hard Magnetic and Magnetocaloric Properties of Nanocrystalline Intermetallics. Issue 34 (11th April 2016)

• Record Type: Journal Article
• Authors: Bessais, L.; Guetari, R.; Zehani, K.; Moscovici, J.; Mliki, N.
• Is Part Of: MRS advances. Volume 1:Issue 34(2016)
• Page Start: 2367
• Page End: 2372
• Publication Date: 2016-04-11
• Subjects: magnetic properties, -- mechanical alloying, -- nanostructure; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/adv.2016.243
• Languages: English
• ISSNs: 2059-8521

Abstract

ABSTRACT: Structural and magnetic properties of nanocrystalline P 6/ mmm R (Fe, M)9 C are presented. Their structure is explained with a model based on the R 1– s (Fe, M )5+2 s formula ( s = vacancy rate) where s R atoms are statistically substituted by s transition metal pairs. The maximum coercivity is obtained for low Ga/Si content for auto-coherent diffraction domain size 30 nm. This controlled microstructure might lead to hard permanent magnet materials. Furthermore, the influence of small amount of Dy substitution on magnetocaloric properties of R -Fe systme is reported. The potential for using these low-cost iron based nanostructured R Fe9 powders in magnetic refrigeration at room temperature is also discussed.