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利用磁控溅射方法制备了纳米Co/Cu多层膜。利用扫描探针显微镜(SPM)观测了其表面形貌和磁畴结构,并通过振动样品磁强计(VSM)测量了磁性。结果表明,薄膜的微结构和磁性随非磁性层厚度的变化有着非常显著的变化。超细Co颗粒构造的多层膜样品,颗粒尺寸逐渐增大,磁畴尺寸先减小后增大,最后发生明显的聚集。磁性金属和非磁性金属的比例对多层膜之间的交换耦合相互作用有显著影响。平行膜面方向上的饱和场明显小于垂直膜面方向。当体积比约为1∶80时,平行膜面方向饱和场为95.9 kA/m,垂直方向饱和场为328.1 kA/m。此时两个方向上的饱和场、剩磁、矫顽力和磁滞损耗均为最小值。
The nano-Co / Cu multilayers were prepared by magnetron sputtering. The surface morphology and magnetic domain structure were observed by using a scanning probe microscope (SPM), and the magnetism was measured by a vibrating sample magnetometer (VSM). The results show that the microstructure and magnetic properties of the films have very significant changes with the thickness of the non-magnetic layer. The multilayer films with ultrafine Co particles have the following features: the size of the particles gradually increases, the size of the magnetic domains decreases first and then increases, finally the obvious aggregation occurs. The ratio of the magnetic metal to the non-magnetic metal has a significant effect on the exchange coupling interaction between the multilayer films. The saturation field in the direction of parallel membrane surface is obviously smaller than the vertical membrane surface direction. When the volume ratio is about 1:80, the saturation field in the direction parallel to the membrane surface is 95.9 kA / m, and the vertical saturation field is 328.1 kA / m. At this point in both directions of the saturation field, remanence, coercivity and hysteresis loss are minimum.