Local magnetization and transport properties in phase-separated (La,Pr)1−Ca MnO3 in the vicinity of the phase transition

Local magnetization has been studied in a phase-separated manganite (La 1− y Pr y ) 0.7 Ca 0.3 MnO 3 ( y =0.7) by a magneto-optical imaging technique simultaneously with resistivity measurements. The observed image demonstrates a region in which magnetization changes corresponding to a telegraph noise in resistive fluctuation. This observation is the first direct evidence for a switching domain in phase-separated manganites.