Magnetic properties of stearate films with 3d transition metal ions fabricated by the Langmuir-Blodgett method

Y. Ando, T. Hiroike, T. Miyashita, T. Miyazaki

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Stearate films with 3d transition metal ions, such as Mn, Fe, Co and Ni, were fabricated by the Langmuir-Blodgett (LB) method. The formation of salts was determined by Fourier transform infrared (FTIR) analysis, and the structure oriented two-dimensionally was confirmed by X-ray analysis and electron spin resonance (ESR) spectroscopy. The hydrocarbon chains with Fe, Co and Ni ions are arranged in a hexagonal unit cell aligned vertically to the film surface. However, the packing arrangement of the hydrocarbon chain with an Mn ion is orthorhombic with a tilt angle of 10° to the film normal direction. The magnetization curves were measured at 4.5 K and the temperature dependence of the magnetic susceptibility was measured in the range 4.5-100 K. The susceptibility of the films showed a Curie-Weiss behaviour. The asymptotic temperature θP of the Ni stearate film was positive, i.e. the film exhibited ferromagnetic interaction. This was explained by assuming the presence of a superexchange interaction of cation-anion-cation type making an angle of 103°-109°.

Original languageEnglish
Pages (from-to)144-149
Number of pages6
JournalThin Solid Films
Volume278
Issue number1-2
DOIs
Publication statusPublished - 1996 May 15

Keywords

  • Electron spin resonance (ESR)
  • Langmuir-Blodgett films (LB films)
  • Magnetic properties and measurements
  • Multilayers

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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