Electric and magnetic properties of nano-structure films produced by computer controlled pulse electrodeposition

脉冲电沉积是一种有用的技术，通过调节脉冲的幅度和宽度，可以实现原子尺度上控制铁磁薄膜的层组成、多层膜的厚度和克尺寸。通过改变阶梯脉冲波，可以在含有两种以上金属离子的单一电解液中制备出具有不同磁性能的铁磁薄膜.我们尝试制备了具有复合铁磁Co层的铁磁纳米结构多层膜，用计算机控制脉冲电沉积方法制备了磁性层Au和非磁性层Ag，并研究了磁性层Au和Ag的磁性与电沉积温度的关系。原子水平的各种多层膜中的磁电阻效应。磁电阻效应与Co铁磁层厚度和Ag、Au非磁层厚度有关。这些薄膜的磁化强度随Ag和Au层厚度的增加而减小。显示MR比最大值的Ag和Au层厚度不必与显示磁化最小值的Ag和Au层厚度一致。磁自旋的反平行排列是产生多层膜巨磁电阻效应的必要条件，但不是充分条件。对于Co/Au多层膜，显示磁化强度最小值的Au层厚度向Au层厚度的高侧移动。

Pulse electrodeposition is a useful technique with which it is possible to achieve atomic-scale control of the layer composition, thickness of the multilayer and the gram size in ferromagnetic films by regulating the pulse amplitude and width. It is possible to produce ferromagnetic films with various magnetic properties from a single electrolytic solution containing more than two kinds of metallic ions, by changing the step pulse wave.We attempted to fabricate ferromagnetic nano-structure multilayer films with the combination ferromagnetic Co layers, and non magnetic layer Au and Ag by computer controlled pulse electrodeposition method.We have investigated the relationship between the magnetism and the magnetoresistance effect in the various multilayer films of the atomic level. The magnetoresistance effect is dependent on both the thickness of Co ferromagnetic layer and Ag,Au non-magnetic layers. The magnetization of these films shows the minimum value against the Ag and Au layer thickness. The Ag and Au layer thickness showing the maximum of MR ratio is not of necessary in agreement with the Ag and Au layer thickness showing the minimum of magnetization. Antiparallel alignment of magnetic spin is a necessary but not sufficient condition in order to generate the GMR of multilayer films. For the Co/Au multilayer films, the Au layer thickness showing the minimum of the magnetization shifts to higher side of the Au layer thickness.