Abstract
Anomalous Hall resistivities of polycrystalline manganite thin films with different grain sizes are reported. Positive anomalous Hall coefficients due to grain boundaries are clearly observed besides a negative contribution in the bulk manganite. The positive contribution becomes pronounced with decreasing grain size in the polycrystalline samples, reaching up to 4.2 μΩ cm at 5 K. The temperature dependence of the anomalous Hall resistivity is in good agreement with its magnetoresistive feature. Possible causes for the anomalous contribution are discussed within existing models for granular magnetoresistive thin films or multilayers.
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