Spin- and charge-modulated trilayer magnetic junctions: La0.7Ca0.3MnO3/La0.45 Ca0.55MnO3/La0.7Ca0.3 MnO3

Moon Ho Jo*, M. G. Blamire, D. Ozkaya, A. K. Petford-Long

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We report on magnetic tunnel junctions entirely made up of mixed-valence manganites, La0.7Ca0.3MnO3/La0.45 Ca0.55MnO3/La0.7Ca0.3 MnO3. In heteroepitaxial junctions, the different Mn3+/Mn4+ mixed-valence ratios can modulate the ground states throughout the trilayer, i.e. ferromagnetic metal/antiferromagnetic insulator/ferromagnetic metal. Interestingly, the tunnel magnetoresistance (TMR) of the device persists up to a higher temperature (T/Tc ≤ 0.75, where Tc is the Curie temperature) as compared to the case for equivalent non-manganite barrier junctions. The enhanced TMR at high temperatures in the present junction is discussed in relation to the properties of the unique interface between the metallic ferromagnet and the antiferromagnetic tunnel barrier, such as the interfacial bonding coherence and a magnetic interlayer coupling.

Original languageEnglish (US)
Pages (from-to)5243-5251
Number of pages9
JournalJournal of Physics Condensed Matter
Volume15
Issue number30
DOIs
StatePublished - Aug 6 2003

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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