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We study an effect of moderate magnetic field on variable range hoppingconductivity in arrays of ferromagnetic granules separated by tunnel barriers.It is shown that the resulting magnetoresistance can be significantly largerthan the standard "giant" magnetoresistance in Fe-N-Fe-N... multilayers. Theeffect is related to a gain in densities of states available for the virtualprocesses within the intermediate granules due to magnetic-field inducedalignment of the granule magnetizations.

Giant magnetoresistance for ensembles of ferromagnetic granules in variable range hopping conductivity regime