Ferroelectric field effect modulation of the magnetic properties of colossal magnetoresistive La$_{1-x}$Sr$_x$MnO$_3$

ORAL

Abstract

In this work, we have tuned the magnetic properties of the colossal magnetoresistive oxide La$_{1-x}$Sr$_x$MnO$_3$ (LSMO) using a ferroelectric field effect approach. Epitaxial LSMO thin films and ferroelectric Pb(Zr,Ti)O$_3$ (PZT) / LSMO heterostructures were fabricated using off-axis RF magnetron sputtering. LSMO films with high crystalline quality and atomically smooth surfaces have been achieved. Using the magneto-optical Kerr effect (MOKE), we measured a shift in the Curie temperature (T$_{\mathrm{c}}$) of LSMO upon switching the polarization direction of PZT, in agreement with the modulation of T$_{\mathrm{c}}$ found from magnetotransport measurements. Unlike the traditional chemical doping approach, the ferroelectric field effect approach allows one to control the magnetism in the system reversibly, without introducing additional lattice disorder/distortion.

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Authors

  • J. Hoffman

    Department of Applied Physics and Center for Research on Interface Structures and Phenomena, Yale University, Department of Applied Physics and Center for Research on Interface Structures and Phenomena, Yale University, New Haven, CT 06520

  • Hajo Molegraaf

    DPMC, University of Geneva

  • Xia Hong

    Department of Physics, Penn State University, Department of Physics, Pennsylvania State University

  • Jean-Marc Triscone

    DPMC, University of Geneva

  • C.H. Ahn

    Yale University, Yale University Department of Applied Physics, Department of Applied Physics, Yale University, Department of Applied Physics and Center for Research on Interface Structures and Phenomena, Yale University, Department of Applied Physics and Center for Research on Interface Structures and Phenomena, Yale University, New Haven, CT 06520