Calculation of giant magnetoresistance in laterally confined multilayers in the current-in-plane geometry

Kingshuk Majumdar, Jian Chen, and Selman Hershfield
Phys. Rev. B 57, 2950 – Published 1 February 1998
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We have studied the giant magnetoresistance (GMR) for laterally confined multilayers, e.g., layers of wires, using the classical Boltzmann equation in the current-in-plane geometry. For spin-independent specularity factors at the sides of the wires we find that the GMR due to bulk and surface scattering decreases with lateral confinement. The length scale at which this occurs is of the order of the film thickness and the mean free paths. The precise prefactor depends on the relative importance of surface and bulk scattering anisotropies. For spin-dependent specularity factors at the sides of the wires the GMR can increase in some cases with decreasing width. The origin of the change in the GMR in both cases can be understood in terms of lateral confinement changing the effective mean free paths within the layers.

  • Received 8 July 1997


©1998 American Physical Society

Authors & Affiliations

Kingshuk Majumdar, Jian Chen, and Selman Hershfield

  • Department of Physics and National High Magnetic Field Laboratory, University of Florida, 215 Williamson Hall, Gainesville, Florida 32611

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Vol. 57, Iss. 5 — 1 February 1998

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