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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, the authors 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 some 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.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
750562
Report Number(s):
ANL/MSD/CP-100313
TRN: US0003337
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 44th Annual Conference on Magnetism and Magnetic Materials, San Jose, CA (US), 11/15/1999--11/18/1999; Other Information: PBD: 26 Oct 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; CALCIUM OXIDES; MANGANESE OXIDES; GRAIN BOUNDARIES; MORPHOLOGY; MAGNETORESISTANCE; HIGH-TC SUPERCONDUCTORS

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., 1999. Web.
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.
Miller, D. J., Lin, Y.-K., Vlasko-Vlasov, V., and Welp, U. Tue . "Grain boundary structures in La{sub 2/3}Ca{sub 1/3}MnO{sub 3} thin films". United States. https://www.osti.gov/servlets/purl/750562.
@article{osti_750562,
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, the authors 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 some 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Oct 26 00:00:00 EDT 1999},
month = {Tue Oct 26 00:00:00 EDT 1999}
}

Conference:
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