The influence of the thickness layers and annealing conditions on the hard magnetic properties of nanocomposite [NdFeBNbCu/FeBSi]xn films

Some results concerning the influence of the thicknesses ratio of the NdFeBNbCu/FeBSi bilayers and annealing conditions on the structural and hard magnetic properties of the Ta/[NdFeBNbCu/FeBSi]center dot n/Ta multilayer thin films with low crystallization temperature are presented. The good hard magnetic characteristics were obtained for the Ta/[NdFeBNbCu(90)/FeBSi(5)]center dot 6/Ta thin films annealed at 630 degrees C for 20 min., and then cooled up down to RT in magnetic field. Thus, the Ta[NdFeBNbCu(90nm)/FeBSi(5nm)]center dot 6/Ta thin films annealed for 20 min. at 630 degrees C and then cooled up down to RT in magnetic field of 8 kG exhibit an increase in coercivity of about 1.37 kG and a noticeable enhancement of the saturation magnetization and the remanent magnetization of about 12 emu/g and 22 emu/g, respectively, as compared with same sample annealed at 630 degrees C for 20 min., and then cooled up down to RT without magnetic field.