Abstract
The coexistence of large positive and negative low-field magnetoresistance (LFMR) in the ferromagnetic La 0.7Ca 0.3MnO 3 thin films with ordered microcrack (MC) distributions is reported. For the films with the highest linear density of MC, the negative LFMR can be up to −60% and rapidly changes to the positive value of 25% at 200 Oe field with the increase of temperature. We discuss the effect based on the spin-polarized tunneling and inhomogeneous magnetic state induced by the natural formations of MC in the films.
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