Phase Transitions of a (La$_{0.5}$Pr$_{0.5})_{0.67}$Ca$_{0.33}$MnO$_{3}$ Thin Film Repeated with Increasing Voltage as Probed by Low Temperature Magnetic Force Microscopy

Low-temperature magnetic force microscopy was used to study the phase diagram of a (La$_{0.5}$Pr$_{0.5})_{0.67}$Ca$_{0.33}$MnO$_{3}$ thin film grown on a (110) NdGaO$_{3}$ (NGO) substrate by pulsed laser deposition. Traditionally, one can observe the phase change at the nanoscale level as the sample is cooled through the transition temperature, but in this case a fixed voltage was applied before each cooling cycle. From in-situ transport measurements, it is observed that the temperature of the peak of the transition increases with applied field; however, the MFM images show that the magnetic transition begins at a lower temperature with the same increase in field.~ The MFM data will be presented to show the complete phase change as it is cooled through each transition at a fixed voltage.