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

ORAL

Abstract

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.

*The work at UT Austin is supported by the NSF (DMR-0923231).

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Authors

  • Frank Ruzicka

    • Department of Physics, The University of Texas at Austin, Austin, Texas 78712

  • Alfred Lee

    • Department of Physics, The University of Texas at Austin
    • Department of Physics, The University of Texas at Austin, Austin, Texas 78712

  • Alex de Lozanne

    • Department of Physics, The University of Texas at Austin
    • Department of Physics, The University of Texas at Austin, Austin, Texas 78712

  • Amlan Biswas

    • Department of Physics, University of Florida, Gainesville, Florida 32611
    • University of Florida
    • Department of Physics, University of Florida, Gainesville, FL 32611

  • Tara Dhakal

    • Department of Physics, University of Florida, Gainesville, Florida 32611

  • Jacob Tosado

    • Department of Physics, University of Florida, Gainesville, Florida 32611
    • MRSEC and CNAM