Structural Peculiarities and Magnetic Properties of FeNi Films and FeNi/Ti-Based Magnetic Nanostructures

Fe 19Ni 81 films and Fe 19Ni 81/Ti-based nanostructures were prepared by rf-sputtering. The thicknesses of FeNi samples were below and above the critical thickness of the transition into transcritical state which controls perpendicular magnetic anisotropy and therefore the low coercivity and magnetic softness. FeNi/Ti-based magnetic nanostructures were designed with focus on high-frequency applications. Their structure was studied by X-ray diffraction. The magnetic properties and magnetic domains were investigated by magneto-optical Kerr effect and Bitter technique. The increase of the grain size was observed with an increase of the total thickness of the films. It was shown that [FeNi}(50\ nm})/Ti}(6\ nm})] 7FeNi}(50\ nm}) nanostructures have the lowest coercivity and interesting structural features which can be responsible for the improvement of their magnetic properties. © 2006 IEEE