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We study the tunneling magnetoresistance in the ensembles of ferromagneticgranules with random easy axes of magnetic anisotropy taking into account theexchange interaction between granules. It is shown that due to the exchangeinteraction magnetoresistance is effectively decoupled from magnetization, i.e.the strongest negative magnetoresistance can be observed at the field wheremagnetization is almost saturated. Under some conditions, the sign ofmagnetoresistance can be reversed and tunneling magnetoresistance can becomepositive at certain magnetic fields. Our theory agrees with measurements ofmagnetoresistance in ensembles of Fe granules in SiCxNy matrix.

Tunneling magnetoresistance in ensembles of ferromagnetic granules with exchange interaction and random easy axes of magnetic anisotropy