Perpendicular transport and magnetization processes in magnetic multilayers with strongly and weakly coupled magnetic layers

Within the framework of a two-band tight-binding model, we have performed calculations of giant magnetoresistance, exchange coupling and thermoelectric power (TEP) for a system consisting of three magnetic layers separated by two non-magnetic spacers with the first two magnetic layers strongly antiferromagnetically exchange-coupled. We have shown how the GMR relates with the corresponding regions of magnetic structure phase diagrams and computed some relevant hysteresis loops, too. The GMR may take negative values for specific layer thicknesses, and the TEP reveals pronounced oscillations around a negative bias.