Abstract
Electrical transport properties of multilayers comprising ferromagnetic layers separated by non-magnetic metallic layers have been studied experimentally by many groupsW. Very large or even giant magnetoresistance (MR) has been obtained in these structures (spin-valve multilayers) in which the relative orientation of the magnetizations in successive ferromagnetic layers can be changed either thanks to the existence of an antiferromagnetic coupling through the spacer layer (as in Fe/Cr(2), Co/Ru(3), Co/Cu(4, 5). . . ) or because of different pinning forces acting on the magnetization of the ferromagnetic layers (different coercivities(6, 7) or exchange anisotropy(8–11)). Qualitatively, it is now widely admitted that this particular MR effect results from a coherent interplay between the successive ferromagnetic layers of spin-dependent scattering (SDS) phenomena occuring at the interfaces and/or in the bulk of the ferromagnetic layers.
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Dieny, B., Speriosu, V.S., Nozières, J.P., Gurney, B.A., Vedyayev, A., Ryzhanova, N. (1993). Magnetoresistance of Spin-Valve Sandwiches and Multilayers (Experiments and Theories). In: Farrow, R.F.C., Dieny, B., Donath, M., Fert, A., Hermsmeier, B.D. (eds) Magnetism and Structure in Systems of Reduced Dimension. NATO ASI Series, vol 309. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-1519-1_24
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