Magnetic properties, phase evolution, and microstructure of melt spun Hf-substituted Sm(Co 0.97Hf 0.03) xC y (x = 5-9; y = 0-0.1) nanocomposites??

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Title:	Magnetic properties, phase evolution, and microstructure of melt spun Hf-substituted Sm(Co 0.97Hf 0.03) xC y (x = 5-9;y = 0-0.1) nanocomposites??
Authors:	Chang, H.W., Guo, C.S., Hsieh, C.C., Chang, W.C
Contributors:	Department of Physics, Tunghai University
Keywords:	Intermetallics;Magnetic properties;Melt spinning
Date:	2011
Issue Date:	2013-05-15T09:09:42Z (UTC)
Abstract:	Magnetic properties, phase evolution, and microstructure of melt spun Hf-substituted Sm(Co 0.97Hf 0.03xC y (x = 5-9; y = 0-0.1) ribbons quenched at the wheel speed of 40 m/s are investigated. X-ray diffraction analysis shows that the main phases existed in Sm(Co 0.97Hf 0.03) x ribbons are 1:5 phase for x = 5-5.5; 1:5 and 1:7 phases for x = 6; 1:7 phase for x = 6.5-7.5; 1:7 and 2:17 phases for x = 8; and only 2:17 phase for x = 8.5-9, respectively. For Sm(Co 0.97Hf 0.03) x (x = 5-9) ribbons, the optimum magnetic properties of Br = 5.6 kG, iH c = 15.6 kOe and (BH) max = 7.1 MGOe are obtained for Sm(Co 0.97Hf 0.03) 6.5 ribbons. Furthermore, a slight amount of C addition in Sm(Co 0.97Hf 0.03) x ribbons slightly modify phase constitution and effectively refine the grain size from 200-700 nm for C free ribbons to 10-70 nm, strengthening the exchange coupling effect between magnetic grains of the ribbons. As a result, magnetic properties are further improved. The magnetic properties of B r = 6.9 kG, iH c = 9.2 kOe and (BH) max = 10.0 MGOe can be achieved for Sm(Co 0.97Hf 0.03) 7.5C 0.1 nanocomposites. ? 2011 American Scientific Publishers.
Relation:	Journal of Nanoscience and Nanotechnology 11 (3) , pp. 2722-2725
Appears in Collections:	[應用物理學系所] 期刊論文

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