Phenomenological theory of the giant magnetoresistance of ferromagnet-nonmagnetic metal granular media |
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Authors: | K Yu Guslienko |
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Institution: | (1) Institute of Magnetism, Academy of Sciences of Ukraine, 252680 Kiev, Ukraine |
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Abstract: | A phenomenological model is developed for the giant magnetoresistance of granular media comprising ferromagnetic granules
in a nonmagnetic metal matrix. Both volume and surface spin-dependent scattering by the ferromagnetic granules are taken into
account. The internal electric fields are inhomogeneous because of the different conductivities of the granules and the matrix.
The dependence of the effective conductivity of the medium on the average magnetization is calculated and used to explain
the giant magnetoresistance effect. The magnetoresistance is plotted as a function of the volume concentration of ferromagnetic
granules and the granule radius. Experiments on Co-Cu and Co-Ag granular films are discussed.
Fiz. Tverd. Tela (St. Petersburg) 40, 1871–1875 (October 1998) |
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Keywords: | |
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