Concentration dependence of giant magnetoresistance in magnetic granular composites |
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| Institution: | 1. CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, China;1. Theoretische Physik I, Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany;2. Department of Physics, University of Wisconsin, Madison, WI 53706, USA;1. Department of Physics, Suzhou University, Suzhou 215006, People''s Republic of China;2. CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, People''s Republic of China;1. Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, P.O. Box 8009 (26), Beijing 100088, China;2. Department of Physics, Suzhou University, Suzhou 215006, China |
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| Abstract: | We combine effective medium theory (EMT) with the two-channel conducting model to study the magnetic granular concentration dependence of a giant magnetoresistance (GMR) in magnetic granular composites. The composite is composed of small magnetic granules (such as Co) embedded in an immiscible nonmagnetic metallic matrix (such as Ag). We present a model for the composite in which the magnetic metallic granules are spherical in shape and have a distribution in sizes, and in which there are different contributions of superparamagnetic and ferromagnetic granules to conductance. The calculated result about the concentration dependence of GMR is in agreement with the experimental data. |
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