Magnetic properties of multiple-structure multilayered Co/noble metal films

Co/noble metal films have new functions such as perpendicular magnetization and giant magneto resistance (GAB). Multiple-strudure multilayered Co/noble films (MSM Co/noble films) were fabricated in order to improve the magnetic properties of Co/noble metal films further. Co/noble metal films and MSM Co/noble metal films were fabricated by a dual-source RF magnetron sputtering onto the rotating glass and polyimide substrates. We analyzed their structures by X-ray diffraction and magnetic properties. Compared with Co/Pd films, the increases in saturated magnetizations and coercive forces are observed in MSM films. Moreover, they show perpendicular amsotropic and multistage loops. The reason why the hysteresis loops become multistage loops is due to there is large coercive force difference between the lowest Co/Pd layer and the upper Co/Pd layer This difference in coercive forces is due to the groundwork effect. As a result of the GMR measurement, a comparatively big GMR value of 6.5% was obtained.