APS Logo

Evidence of phase separation in a (La,Pr,Ca)MnO<sub>3</sub> thin film by ferromagnetic resonance.

ORAL

Abstract

Phase separation (PS) in (La,Pr,Ca)MnO3 (LPCMO) manganites is the responsible for the colossal magnetoresistance (CMR) and a complex phase diagram for these systems [1]. The PS in the LPCMO between a ferromagnetic metal (FMM) phase and an antiferromagnetic charge-ordering insulator (AFM-COI) phase could be: (i) a fluid phase separation (FPS) between FMM and AFM-COI, both with a dynamic fluid-like behavior or (ii) a static phase separation (SPS) at lower temperatures with a glassy behavior [2]. The FPS to SPS transition could be a glass-like one associated to a strain-liquid to strain-glass transition [3]. Here we report ferromagnetic resonance (FMR) and transport measurements on a LPCMO thin film across the FPS to SPS transition. Changes in the FMR signal allow to identify the possible temperature ranges for the FPS and SPS states. We confirm by micromagnetic simulations that percolation paths of FMM phase give rise to additional resonance frequencies in the FPS state, which could open the possibility of magnonic control in the LPCMO thin films.

[1] M. Uehara et. al. Nature 399, 561–564 (1999).
[2] W. Wu et al. Nat. Mater. 5, 881–886 (2006).
[3] P.A. Sharma et. al. Phys. Rev. B. 71, (2005).

–

Presenters

  • Diego Carranza-Celis

    UNIVERSIDAD DE LOS ANDES

Authors

  • Diego Carranza-Celis

    UNIVERSIDAD DE LOS ANDES

  • Elizabeth Skoropata

    Oak Ridge National Lab, Paul Scherrer Institute

  • Amlan Biswas

    University of Florida, Department of Physics, University of Florida

  • Michael Fitzsimmons

    University of Tennessee, Knoxville, University of Tennessee

  • Ivan Schuller

    University of California, San Diego, Dept. of Physics and Center for Advanced Nanoscience, UCSD, La Jolla, CA, USA, Physics Department, University of California, San Diego, Department of Physics, University of California, San Diego

  • Juan G. Ramirez

    Department of Physics, Universidad de los Andes, Bogotá, Colombia, UNIVERSIDAD DE LOS ANDES