Negative and Positive Effect of Giant Magnetoresistance in The Magnetically Ordered Sandwich

Using the modified Fuchs-Sondheimer model [1,2] in the framework of the two-current model [3-5], the analysis of the effect of giant magnetoresistance in the magnetically ordered sandwich was theoretically performed. The conditions under which either negative or positive giant magnetoresitive effect is observed and their amplitude reachs maximum were determined.