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

We have calculated the extraordinary magnetoresistance of an InSb van der P auw disk with a centrally embedded cylindrical metallic inhomogeneity by so lving the Maxwell equations with corresponding boundary value conditions. T he room temperature MR of such a device can exceed 100% at 500 G. Our calcu lations incorporate no adjustable parameters and are in excellent agreement with our recent experimental results provided the finite size of the conta ct electrodes is included. (C) 2001 Elsevier Science B.V. All rights reserv ed.