Structure and magnetic properties of Nd-doped nano-magnetic FeCo thin films

A series of nano-magnetic thin films of Ta/FeCoNd/Ta were fabricated on Si 〈111〉 substrate by RF magnetron sputtering with various power of Nd target. The structure and magnetic properties of FeCoNd films with Nd concentration and annealing temperature with magnetic field under vacuum were investigated. The as deposited films are amorphous. The size of the FeCo and FeCoNd nano-crystallites increases with the increasing of annealing temperature. The results from vibrating sample magnetometer measurement revealed that the saturation magnetization decreases with increasing of Nd concentration. An in plane magnetic anisotropic property of FeCoNd films was obtained by vacuum annealing with magnetic field. The Ta/Nd20(FeCo)80/Ta sample shows the coercivity of 199 and 135.32A/m at easy and hard axes respectively and anisotropic field of 8166.96A/m,indicating the potential application in high-frequency fields.