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We report a comparative study of the spin-dependent electronic transport in two types of granular ferromagnetic systems: ferromagnet metal (Ni-Ag, Co-Ag) and ferromagnet insulator (Ni-SiO₂, Co-SiO₂). Both systems demonstrate remarkably similar magnetoresistive behavior of comparable magnitude: negative isotropic magnetoresistance below the ferromagnet percolation threshold and the anisotropic magnetoresistance above.
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Milner et al. (1996) studied this question.
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