We have investigated the relationship between the magnetism and the magnetoresistance effect in the Co/Au, Ag multilayer films with layers produced in the atomic level by pulse electrodeposition method. 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. IntroductionThe studies on the physical properties of the nano-ordered multilayer films have attracted much attention not only in the fundamental physics, but also in electronic engineering. The productions of multilayered films have been attempted actively by the several methods. Though the electrodeposition is not by no means easy to find a suitable condition for deposition, it has a significance as a useful means to prepare the nano-ordered thin films, even if the suitable deposition condition could be established successfully. Furthermore, it becomes a very useful method for the development of the research in nano-ordered multilayered films with the combination of ferromagnetic and non-magnetic layers, which shows the giant magnetoresistance effect [1][2][3]. It is possible to control the film composition, thickness of multilayer and grain size in an atomic order by regulating the pulse amplitude and width [4][5][6][7]. If the pulse width of deposition time to produce multilayers is reduced to very small values, the multilayer film with layers of two different atomic compositions eventually results in a binary alloy of solid solution type mixed in the atomic level.In this present work, we have investigated the relationship between magnetism and magnetoresistance effect in the Co/Au, Ag films with layers produced in the atomic level by pulse electrodeposition method.
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