Magnetization and magnetostriction of melt-spun TbDyCeFe ribbons

The magnetization and magnetoelastic properties of melt-spun ribbons Tb.3Dy .7(CezFe1-z)(1.96) (0.025 less than or equal to z less than or equal to 0.2 ) have been investigated as a function of increasing cerium content. The ri bbons exhibit a nanocrystalline structure which becomes more amorphous with increasing cerium content. Room temperature coercivities remain similar to 80 kA/m but low temperature coercivities increase with cerium percentage, A change in the anisotropy is observed, below 50 K, for the 0.125 compositi on, resulting in nonsaturation of the sample, Saturation magnetostriction l ambda (s) varies considerably with the addition of Ce, reaching a maximum o f 850 ppm at 230 K, for z = 0.075 composition.