Extraordinary magneto resistance of a semiconductor-metal composite van der Pauw disk

We have calculated the extraordinary magnetoresistance of an InSb van der Pauw disk with a centrally embedded cylindrical metallic inhomogeneity by solving the Maxwell equations with corresponding boundary value conditions. The room temperature MR of such a device can exceed 100% at 500 G. Our calculations incorporate no adjustable parameters and are in excellent agreement with our recent experimental results provided the finite size of the contact electrodes is included. (C) 2001 Elsevier Science B.V. All rights reserved.