Magnetic properties and crystal structure of melt-spun Sm(Co, M) 7 (M = Al and Si) ribbons

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Title:	Magnetic properties and crystal structure of melt-spun Sm(Co, M) 7 (M = Al and Si) ribbons
Authors:	Hsieh, C.C., Shih, C.W., Liu, Z., Chang, W.C., Chang, H.W., Sun, A.C., Shaw, C.C.
Contributors:	Department of Physics, Tunghai University
Keywords:	Al content;Al substitution;Element substitution;Grain size;Magnetic anisotropy field;Melt-spun;Type structures
Date:	2012
Issue Date:	2013-05-15T09:08:32Z (UTC)
Abstract:	Effect of Si and Al contents on the magnetic properties and crystal structure of melt-spun SmCo 7-xM x (M = Al and Si) ribbons have been investigated. The Rietveld refinement results show that Al and Si prefer to occupy the 3g site in the TbCu 7-type structure. The changes in both the magnetocrystalline anisotropy field and the microstructure with Si or Al substitution may account for the variation of magnetic properties. The coercivity of SmCo 7-xSi x ribbons is enhanced from 1.9 kOe for SmCo 7 to 4.7 kOe for SmCo 6.5Si 0.5 and 2.6 kOe for SmCo 6.95Al 0.05, which is mainly because of the enhancement of magnetic anisotropy field by the Si and Al substitution for Co in 3g sites. Furthermore, in melt-spun SmCo 7-xM x ribbons system, with increasing x, the grain size is slightly reduced for M Si, but increased for M Al. In addition, with further increasing x, the enhancement of coercivity is attributed to both the third element substitution for Co in 3g sites and grain refinement. ? 2012 American Institute of Physics.
Relation:	Journal of Applied Physics 111 (7) , art. no. 07E306
Appears in Collections:	[應用物理學系所] 期刊論文

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