Magnetostriction of hard magnetic Nd80Fe20 mold-cast rod

Results of linear magnetostriction measurements on a Nd80Fe20 mold-cast rod applying a field up to 9 T parallel and perpendicular to the axis of the rod are presented. At 4.5 K, the parallel and perpendicular magnetostrictions at an applied field of μ0H=9T are −366×10−6 and −180×10−6, respectively, indicating that the pure Nd crystalline phase formed in Nd80Fe20 during the solidification exhibits a crystallographic and a magnetic anisotropy. At 280 K, the Nd80Fe20 rod is magnetically isotropic and exhibits a positive magnetostriction of 36×10−6, at μ0H=9T. The magnetostrictive properties are discussed based on the temperature dependence of magnetization and thermal expansion in conjunction with the previously reported results about the microstructure of the same specimen.