The giant magnetostriction of [Fe/Tb/Fe/Dy]_n multilayer films under different annealing temperature

The effect of annealing temperature on the magnetic giant magnetostriction (GMS) of [Fe/Tb/Fe/Dy]_n multilayer films were investigated. X-ray diffraction showed that the multilayer films' microstructures were still in amorphous at annealing temperature 300°C. The multilayer films began to crystalline at annealing temperature 400°C. The saturation magnetization of multilayer films increased by the increasing annealed temperature. The coercivity first decreased at annealing temperature 300°C then increased when the annealing temperature was higher than 400°C. The multilayer films had good low-field GMS, the magnetostriction of the multilayer films increased by the increasing annealing temperature.