Magnetoresistance of magnetic multilayers in the CPP mode:evidence for non-local scattering

Details Magnetoresistance of magnetic multilayers in the CPP mode:evidence for non-local scattering Magnetoresistance of magnetic multilayers in the CPP mode:evidence for non-local scattering

1999-06-28

arxiv.org/abs/cond-mat/9906410v1

Physics

Condensed Matter

4 pages, 3 figures, submitted to PRL

Scientific paper

We have carried out measurements of the magnetoresistance MR(H) in the CPP (Current Perpendicular to the Plane) mode for two types of magnetic multilayers which have different layer ordering. The series resistor model predicts that CPP MR(H) is independent of the ordering of the layers. Nevertheless, the measured MR(H) curves were found to be completely different for the following two configurations:[Co(1nm)/Cu(20nm)/Co(6nm)/Cu(20nm)]*N and [Co(1nm)/Cu(20nm)]*N[Co(6nm)/Cu(20nm)]*N showing that the above model is incorrect. We have carried out a calculation showing that these results can be explained quantitatively in terms of the non-local character of the electron scattering, without the need to invoke spin-flip scattering or a short spin diffusion length.

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