TITLE

Current-induced electroresistive effect in mixed-phase La0.67Ca0.33MnO3 thin films

AUTHOR(S)
A. Masuno; T. Terashima; Y. Shimakawa; M. Takano
PUB. DATE
December 2004
SOURCE
Applied Physics Letters;12/20/2004, Vol. 85 Issue 25, p6194
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We examined electroresistive effects of epitaxial thin films of La0.67Ca0.33MnO3 deposited on LaAlO3(100) substrates. To be noted here is that these oxides are considerably lattice-mismatched. Measurements of the resistivity, magnetoresistance effect, and current-voltage characteristics of these films revealed that they were inhomogeneous and composed of domains of the highly strained charge-ordered insulator (COI) and the less strained ferromagnetic metal (FMM). By using a microfabricating process, we obtained high current densities and observed a current-induced irreversible behavior at low temperature. The irreversibility became larger with increasing current density. Below the insulator-metal (ferromagnetic) transition temperature, spin-polarized electrons in the FMM domains were injected into the neighboring COI domains. There they forced antiferromagnetically ordered spins to align parallel, leading to a current-induced first-order transition from the COI to the FMM.
ACCESSION #
15374338

 

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