Spin dependent tunneling in 80NiFe/LB film with ferrocene and tris(bipyridine)ruthenium derivatives/Co junctions

Y. Ando, J. Murai, T. Miyashita, T. Miyazaki

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

80NiFe/LB-film/Co tunnel junctions with poly-N-dodecyl-acrylamide and its copolymer with the ferrocene derivative (Fc) or the tris(bipyridine)ruthenium complex (Ru) have been fabricated. FTIR spectra and small angle X-ray diffraction patterns for Fc, Ru and their mixture LB films indicated the formation of highly ordered molecular structure. The Bohr magneton number per one ferrocene moiety showed no difference between the film of Fc and the mixed film with Ru in the dark. However, UV-visible absorption and fluorescence spectra indicated that the electron transfer process in the mixed LB films occurred by an irradiation of light. The tunnel junctions using these LB films showed tunnel magnetoresistive effect. Its magnetoresistive ratio was 0.4% at room temperature being very small in comparison with the tunnel junction with Al2O3 tunnel barrier. The reason for this was considered to be residual water in the LB film causing a structural change of Co or the oxidation of the Co surface, so that the spin polarization could have become low.

Original languageEnglish
Pages (from-to)158-164
Number of pages7
JournalThin Solid Films
Volume331
Issue number1-2
DOIs
Publication statusPublished - 1998

Keywords

  • Ferrocene
  • Langmuir - Blodgett films
  • Magnetization
  • Ruthenium complex
  • Tunneling magnetoresistive effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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