The galvanomagnetic properties of La0.65Ca0.35MnO3 manganite films with a thickness of 0,2?m on the Pb2.9Ba0.05Sr0.05(Zr0.4Ti0.6)O3 ceramics substrates have been investigated.
We have found the irreversible increase of film resistivity () in the process of number acts of inverse of direction of substrate polarization. The nature of effect is connected with a mechanical stress and local electrical currents. Wide range of monotonic increase of resistivity =1.810-2 - 1.8cm without destruction of macroscopic homogeneity of film conductivity is explained by appearance of a new boundaries in the structure and decreasing of size of regions without film defects. The maximal size of region (3-10 m) is provided by the grain of ceramic substrate. The minimal size has order of 100 nm.
The films demonstrated the negative low - field magnetoresistive effect with the saturation field about H=1.5 kOe at T=100-180 K and linear decreasing type of temperature dependence.

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1. Transport and magnetic properties of La_2/3Pb_1/3MnO₃ thin films