MAGNETIC-PROPERTIES OF Y(FE,M)(10)SI-2 COMPOUNDS (M=FE,NI,CO AND MN)

The magnetic properties of Y(Fe1-xCox)(10)Si-2 compounds with x = 0, 0 .2, 0.4, 0.6, 0.8 and 1.0 and YFe(8)M(2)Si(2) compounds with M = Fe, N i, Co and Mn have been investigated. All investigated compounds are is otypical and crystallize in the ThMn12-type structure. The Co concentr ation dependence of the Curie temperature T-C of Y(Fe1-xCox)(10)Si-2 c ompounds exhibits a maximum. Substitution of Mn for Fe leads to a dist inct decrease of T-C. Substitution of Ni for Fe has no remarkable infl uence on T,. The X-ray diffraction patterns of magnetically aligned sa mples show that the easy magnetization direction at room temperature i s along the c-axis for all YFe,M,Si, compounds with M = Fe, Co, Ni and Mn. Substitution of Mn and Ni for Fe leads to a pronounced decrease o f the anisotropy field, whereas substitution of Co for Fe has no remar kable influence on the anisotropy field. The anisotropy fields of YFe, Mn,Si, and YFe,Ni,Si, increase monotonously with decreasing temperatur e.