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Domain Wall Magnetoresistance

The giant magnetoresistance effect (GMR) in magnetic layered structures and magnetic tunneling junctions arises because the direction of the magnetic moment changes abruptly from one magnetic layer to the neighbouring magnetic layer. A similar but much smaller effect is expected to occur for a domain wall in a pure magnetic material since the magnetic moment in the wall also rotates from one atomic plane to the next but the rotation is now much more gradual (see Fig. 1). We have investigated the dependence of the domain wall magnetoresistance on the thickness of the domain wall and the results for a domain wall in cobalt are shown in Fig. 2.

Fig. 1

Fig. 2