Magnetostriction of melt-spun Fe_(85)Ga_(15), Fe_(78)Ni_7Ga_(15) and Fe_(78)Co_7Ga_(15) stacked ribbon samples

摘要

A set of stacked ribbon samples with the compositions Fe_(85)Ga_(15), Fe_(78)Ni_7Ga_(15) and Fe_(78)Co_7Ga_(15) were prepared. XRD on these ribbons show that the binary Fe_(85)Ga_(15) ribbon exhibits the disordered A2 structure whereas the addition of Co and Ni leads to the appearance of an additional ordered DO_3 structure. A comparison of the ratio of the XRD-line intensities gave strong evidence of a (10 0) texture perpendicular to the ribbon surface. The optical studied microstructure supports these results because it shows a columnar grain growth parallel to the solidification direction-which is parallel to ribbon thickness. The highest magnetostriction was found for Fe_(78)Ni_7Ga_(15) (370 ppm), while the Fe_(78)Co_7Ga_(15) a smaller magnetostriction of 270 ppm was found. The enhancement of the magnetostriction is attributed to the (100) texture in these ribbons.