skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Grain boundary structures in La{sub 2/3}Ca{sub 1/3}MnO{sub 3} thin films

Abstract

As with many other oxide-based compounds that exhibit electronic behavior, structural defects have a strong influence on the electronic properties of the CMR manganites. In this work, we have studied the effect of grain boundaries on the transport properties and on the local orientation of magnetization. Thin films of the perovskite-related La{sub 2/3}Ca{sub 1/3}MnO{sub 3} compound were deposited onto bicrystal substrates using pulsed laser deposition. Transport measurements showed an enhancement of magnetoresistance across the grain boundary. The structure of the boundary was evaluated by electron microscopy. In contrast with the highly meandering boundaries typically observed in bicrystals of high-temperature superconductors, the boundaries in these films are relatively straight and well defined. However, magneto-optical imaging showed that the local magnetization was oriented out of the plane at the grain boundary while it was oriented within the plane in the grains on either side. This coordinated reorientation of local magnetization near the grain boundary leads to enhanced magnetoresistance across the boundary in low fields. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [1]
  1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Publication Date:
OSTI Identifier:
20216281
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 9; Other Information: PBD: 1 May 2000; Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; CALCIUM OXIDES; MANGANESE OXIDES; THIN FILMS; GRAIN BOUNDARIES; MICROSTRUCTURE; MAGNETO-OPTICAL EFFECTS; MAGNETIZATION; EXPERIMENTAL DATA

Citation Formats

Miller, D. J., Lin, Y. K., Vlasko-Vlasov, V., and Welp, U. Grain boundary structures in La{sub 2/3}Ca{sub 1/3}MnO{sub 3} thin films. United States: N. p., 2000. Web. doi:10.1063/1.372832.
Miller, D. J., Lin, Y. K., Vlasko-Vlasov, V., & Welp, U. Grain boundary structures in La{sub 2/3}Ca{sub 1/3}MnO{sub 3} thin films. United States. doi:10.1063/1.372832.
Miller, D. J., Lin, Y. K., Vlasko-Vlasov, V., and Welp, U. Mon . "Grain boundary structures in La{sub 2/3}Ca{sub 1/3}MnO{sub 3} thin films". United States. doi:10.1063/1.372832.
@article{osti_20216281,
title = {Grain boundary structures in La{sub 2/3}Ca{sub 1/3}MnO{sub 3} thin films},
author = {Miller, D. J. and Lin, Y. K. and Vlasko-Vlasov, V. and Welp, U.},
abstractNote = {As with many other oxide-based compounds that exhibit electronic behavior, structural defects have a strong influence on the electronic properties of the CMR manganites. In this work, we have studied the effect of grain boundaries on the transport properties and on the local orientation of magnetization. Thin films of the perovskite-related La{sub 2/3}Ca{sub 1/3}MnO{sub 3} compound were deposited onto bicrystal substrates using pulsed laser deposition. Transport measurements showed an enhancement of magnetoresistance across the grain boundary. The structure of the boundary was evaluated by electron microscopy. In contrast with the highly meandering boundaries typically observed in bicrystals of high-temperature superconductors, the boundaries in these films are relatively straight and well defined. However, magneto-optical imaging showed that the local magnetization was oriented out of the plane at the grain boundary while it was oriented within the plane in the grains on either side. This coordinated reorientation of local magnetization near the grain boundary leads to enhanced magnetoresistance across the boundary in low fields. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.372832},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 87,
place = {United States},
year = {2000},
month = {5}
}