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

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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 ... continued below

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14 p.

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Miller, D. J.; Lin, Y.-K.; Vlasko-Vlasov, V. & Welp, U. October 26, 1999.

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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.

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14 p.

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INIS; OSTI as DE00750562

Medium: P; Size: 14 pages

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  • 44th Annual Conference on Magnetism and Magnetic Materials, San Jose, CA (US), 11/15/1999--11/18/1999

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  • Report No.: ANL/MSD/CP-100313
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 750562
  • Archival Resource Key: ark:/67531/metadc702097

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  • October 26, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 7, 2017, 2:30 p.m.

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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, article, October 26, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc702097/: accessed November 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.