Abstract
It is shown that two circumstances must be taken into account in order to describe the tunneling magnetoresistance and Hall effect in granular ferromagnetic metals: 1) the size variance of the metallic granules and 2) the percolation character of the tunneling conductivity of the system, determining the optimal (temperature-dependent) size of the granules through which current transport occurs. This complicates the dependences of the magnetoresistance and Hall resistance of the system on its magnetization and temperature.
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Pis’ma Zh. Éksp. Teor. Fiz. 69, No. 8, 579–584 (25 April 1999)