Magnetoresistance of La0.7Ca0.3MnO3 thin film biepitaxial step junctions

S. F. Chen*, W. J. Chang, S. J. Liu, Jenh-Yih Juang, Jiunn-Yuan Lin, Kaung-Hsiung Wu, T. M. Uen, Y. S. Gou

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

The biepitaxial La0.7Ca0.3MnO3 (LCMO) thin films grown on SrTiO3 substrates using a buffer layer of anatase TiO2 were fabricated. The magnetoresistance (MR) of biepitaxial step junction (BSJ) across the boundary layer of biepitaxial LCMO (0 0 1) and LCMO (1 1 0) film was investigated. The temperature and field dependence of MR for BSJ are qualitatively similar to those obtained in other type of artificial grain boundaries with a comparable MR ratio at low temperatures. However, the observed linear current-voltage characteristic across BSJ is in sharp contrary to the commonly reported non-ohmic characteristics. The results are consistent with features predicted by the model of spin-dependent transport across a depressed magnetic ordering and metallic-like junction layer.

Original languageEnglish
Pages (from-to)267-274
Number of pages8
JournalPhysica B: Condensed Matter
Volume336
Issue number3-4
DOIs
StatePublished - 1 Aug 2003

Keywords

  • Biepitaxial step junction
  • Grain boundary
  • LCMO
  • Magnetoresistance

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