Abstract
Since the discovery of giant magnetoresistance (GMR) in Fe/Cr multilayers1, the magneto-transport properties of magnetic multilayers have received considerable attention over the past few years2–12. The GMR effect is of fundamental importance in that it reveals the interplay between electron transport and magnetism. It has been associated with the existence of antiferromagnetic exchange coupling between the ferromagnetic layers across the non-magnetic layers2, 3. Furthermore, the electrical resistivity of some of these multilayers can be reduced by as much as a factor of two upon the application of an external magnetic field1; the sheer size of this effect makes these materials potential candidates for magneto-resistive applications. A number of other magnetic multilayer systems, such as Co/Ag4and (Ni81Fe19)/Cu5, have also been found to exhibit the GMR effect as the result of extensive research efforts.
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