We have studied magnetoresistance and Hall effects for 1.8-nm-thick Pt filmsgrown on a ferrimagnetic insulator Y3Fe5O12 in a wide temperature (0.46-300 K)and magnetic-field (-15-15 T) region. In the low-temperature regime wherequantum corrections to conductivity are observed, weak antilocalizationbehavior observed in Pt films is critically suppressed when the film isattached to Y3Fe5O12. Hall resistance in the Pt film is also affected byY3Fe5O12, and it exhibits logarithmic temperature dependence in a broadtemperature range. The magnetotransport properties in the high-field range aresignificantly influenced by the interface between Pt and Y3Fe5O12.
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