Tb_yDy_(1-y)(Fe_(1-x)T_x)_2(T=Al,Mn)的磁致伸缩与内禀磁致伸缩特性

MAGNETOSTRICTION OF Tb_yDy_(1-y)(Fe_(1-x)T_x)_2(T=Al,Mn) AND THEIR INTRINSIC MAGNETOSTRICTIVE PROPERTIES

用直拉单晶生长系统制备ＴｂｙＤｙ１－ ｙ（Ｆｅ１ － ｘＴｘ）２（ Ｔ＝ Ａｌ，Ｍｎ） 单晶，并测量其磁致伸缩．用电弧炉合成多晶ＴｂｙＤｙ１ － ｙ（Ｆｅ１－ ｘＴｘ）２（ Ｔ＝ Ａｌ，Ｍｎ） ，并用Ｘ 射线衍射方法测量拟合得到内禀磁致伸缩．结果表明，Ａｌ 和Ｍｎ 替代后饱和磁场降低，说明Ａｌ 和Ｍｎ 的替代明显地降低了各向异性能．随Ａｌ 和Ｍｎ 替代量的增加，总的趋势是材料的内禀磁致伸缩λ１１１ 降低．对Ｔｂ０－５Ｄｙ０－５（Ｆｅ０－９ Ｍｎ０－１）２ 单晶，在不加压情况下的磁致伸缩效果并不明显，但当施加压力时，磁致伸缩变化显著，尤其在１２ —２６ ＭＰａ 压力下，磁致伸缩变化很大，且低场效果很好．

Magnetostriction of Tb y Dy 1-y (Fe 1- x T x ) 2( T =Al,Mn) single crystals, prepared by the MCGS\|3 CZ instrument, was investigated.The intrinsic magnetostrictive properties were derived by fitting method of X\|ray diffraction patterns of polycrystal samples prepared by arc\|melting method. The substitution of Al,Mn for Fe lowers the saturation field and magnetocrystalline anisotropic energy. The intrinsic magnetostriction, λ 111 ,decreases with increasing amount of Al or Mn.For Tb \{0.5\} Dy 0.5 (Fe 0.9 Mn \{0.1\}) 2 single crystals, a large magnetostriction and high d 33 can be obtained under the compressive stress of 12—26 MPa.